Journal of Mathematical Physics
Contravariant rank two tensors which are divergence‐free on one index and which are constructed from the metric tensor, an auxiliary collection of arbitrary tensor fields, and the first and second partial derivatives of these quantities are classified. The results generalize existing mathematical arguments in support of the Einstein field equations
On the Structure of Divergence-Free Tensors, J. Math. Phys 19 (1978), 2570–2575.