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  I want to reference Eq. \ref{eq:comp}. Can this be done in Authorea??            ∭  V      (    ∇⋅E  )      dV=      ∯  S      (    E⋅n  )      dS   \[\iiint_V {\left( {\nabla \cdot {\mathbf{E}}} \right)}dV = \mathop{{\int\!\!\!\!\!\int}\mkern-21mu \bigcirc}\nolimits_S   {\left( {{\mathbf{E}} \cdot {\mathbf{n}}} \right)} dS\]