P. Delucia et P. Morales, NONCOMMUTATIVE DECOMPOSITION-THEOREMS IN RIESZ SPACES, Proceedings of the American Mathematical Society, 120(1), 1994, pp. 193-202
We show that an additive function defined on an orthomodular poset and
taking its values in the positive cone of a normed Riesz space admits
a Lebesgue Decomposition and a Yosida-Hewitt Decomposition.