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\section{References}   References can be listed in any standard referencing style \section{Space-mass balance}  A flat universe is consistent with the cosmological solution of general relativity  that uses admits  a {\bf numbering} system (i.e. not Harvard referencing style), \emph{fair balance} between kinetic energy (expansion)  and should be consistent potential energy (mass). We note that even in the universe with accretion of \emph{space-mass} it is possible to associate to the creation of space the kinetic energy because each galaxy moves away by others.\\  Also, if the increase in mass is correlated to an increase in potential energy (more gravity) then the fair balance, for the general relativity, corresponds to a fair balance  between references within mass and space in  a given article. However, key points include:   \begin{itemize} flat universe.\\  There are two distinct possibilities on balancing Space-Gravity:  \begin{enumerate}  \item Journal abbreviations should follow the Index Medicus/MEDLINE abbreviation approach.   \end{itemize}   \begin{itemize} The balancing Space-Gravity is an invariant of the universe, from its origins (see relativistic cosmology)  \item Datasets should be cited The balancing Space-Gravity is reached only at a particular time of cosmic evolution (see inflationary cosmology)  \end{enumerate}  We remember that  in general relativity  the reference section mass-energy tensor of the universe (defined as everything that is physically observable) is constant, in this way it defines a constant metric in time.\\  Instead we observe that a universe with increasing mass-energy implies a variation of the mass-energy tensor  and should follow one of these examples.   \end{itemize}   \begin{itemize}   \item Only articles, datasets then a variation of the metric.\\  In a theory where the mass is the source of space  and abstracts gravity, we highlight the following possibilities: the increase in the number of massive particles in the universe generates more gravity (increasing curvature implies metric variation), but also the space is increasing with a consequent weakening of gravity (decreasing curvature).\\  We note also  that have been published or are Hubble's law has a paradoxical consequence: an increase of space (volume) implies an increase  in press, or are available through public e-print/preprint servers/data repositories, may kinetic energy because the expansion it is equivalent to movement away.\\  In this way the presence of the scale factor $a(t)$ (expansion) in the metric of the relativistic cosmological equations must  be cited. Unpublished abstracts, papers that have been submitted but not yet accepted, a consequence of the expanding universe  and personal communications should instead be included thus of the increasing \emph{kinetic} energy  in the text, universe  and should not  be referred placed ad hoc  to as ‘personal communications’ admit a solution with expansion.\\  The relativistic cosmological equation would therefore lacking of something: there is not a term describing the \emph{mass} (and energy) that generates space.\\  This \emph{mass} would give space to the universe (galaxies away from each other)  or ‘unpublished reports’ thus giving kinetic energy of expansion, not only that but at passage the cosmic time the galaxies become relatively faster  and faster (thus a larger universe would have more kinetic energy).\\  We ask us whether this is not  the researchers involved should be named. It aspect that we denote as acceleration of the galaxies. In this moment this last possibility  is assumed valid, postponing to later  the responsibility further development  of this issue.\\  In case of variable metric it can believe, then, that during  the authors expansion of the universe, there is possible  to ensure they have a particular \emph{moment} or \emph{phase} in which the universe achieves a fair balance between gravity and space: \emph{have so much gravity as much as space}.\\  Remember that an expansive universe we have the equivalence between expansion and movement away:\\  (figure)\\  A condition of equal balance between gravity (mass) and space will thus be expressed by the relation $K_{exp} = K_{escape} = U_g$. From this condition of equality, in any gravitational system, we  obtain permission the well-known escape velocity:  \begin{equation}  v^2 = G \frac{2 M}{R}  \end{equation}  If we combine this relationship with the Hubble law (with the condition that the speed of expansion of a sphere with radius $R$ is equivalent  to quote any personal communications a speed of escape  from the cited individuals.   \end{itemize}   \begin{itemize}   \item Web links, URLs, a distant center $R$), we obtain:  \begin{equation}  H^2 R^2 = G \frac{2 M}{R}  \end{equation}  from which we get easily  \begin{equation}\label{critical_density}  \rho = \frac{M}{V} = \frac{M}{\frac{4}{3} \pi R^3} = \frac{3 H^2}{8 \pi G}  \end{equation}  for all distance $R$  and links to for any time $t$ of any local observer.\\  The (\ref{critical_density}) equation is  the authors’ own websites should be included as hyperlinks within the authors' manuscript (e.g. 'Mouse Tumor Biology Database'), well-known critical density\footnote{ref}. This condition is in the Newtonian  and not as references.   \end{itemize}   \begin{itemize}   \item References relativistic cosmology\footnote{ref. 4} for a flat universe.\\  However, if the geometry of the universe in the relativistic cosmology remains unchanged over time (from Big Bang  to trials the present days), in our model the metric may change over time because dependent  on a clinical trial database should be as follows:   [Authors/name the growth rate  of group], [title space and gravity. Only if it reaches a fair balance  of increasing between space and gravity  the trial], In: ClinicalTrials.gov [cited year month date], Available from [URL of universe reaches  the link from ClinicalTrials.gov] e.g. Kovacs Foundation, The Effect condition  of Ozone Therapy for Lumbar Herniated Disc. In: ClinicalTrials.gov [cited 2012 Aug 30], Available from http://clinicaltrials.gov/ct2/show/NCT00566007   \end{itemize} flat universe (Critical Universe).