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\end {itemize}  In many cases, the justification for inclusion of assertions appeals to authority, through the citation of the resource the knowledge was extracted from.  Authority, at least in scientific research, is only a short cut for validating knowledge, and good knowledge graphs should encode as much justification for their assertions as they can.  We consider graphs without provenance concerning attribution or justification to be ``bare statement'' {\em bare statement graphs}. Bare statement  graphs and are  not true knowledge graphs, since they do not  provide no a  way to confirm that a given assertion can be assertions are  justified or is are  even believed by the original asserter, which their originators; this  is a minimal (but not sufficient \cite{Gettier_1963}) criteria for ``knowledge'' in a knowledge graph. \begin {itemize}  \item Knowledge graphs may include uncertainty assessments.