1. On the absolute equivalence of projections;Brown, Arlen;Bul. Inst. Politehn. Ia\c{s}i (N.S.),1958
2. A note on orthomodular lattices;Foulis, David J.;Portugal. Math.,1962
3. P. R. Halmos, Introduction to Hilbert space, 2nd ed., Chelsea, New York, 1957.
4. A Radon-Nikodym theorem in dimension lattices;Holland, Samuel S., Jr.;Trans. Amer. Math. Soc.,1963
5. Any orthocomplemented complete modular lattice is a continuous geometry;Kaplansky, Irving;Ann. of Math. (2),1955