@article{10_1017_S0017089500001129,
     author = {Foulis, D. J. and Randall, C. H.},
     title = {Conditioning maps on orthomodular lattices},
     journal = {Glasgow mathematical journal},
     pages = {35--42},
     year = {1971},
     volume = {12},
     number = {1},
     doi = {10.1017/S0017089500001129},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001129/}
}