This paper studies axiom systems of supermatroids. Barnabei et al.'s base axioms concerning poset matroids (i.e., distributive supermatroids) are generalized to modular supermatroids, and a mistake in the proof of base axioms of poset matroids is pointed out.
"Base Axioms of Modular Supermatroids." J. Appl. Math. 2014 1 - 6, 2014. https://doi.org/10.1155/2014/126345