@article{10_4153_CJM_1975_103_8,
     author = {Weaver, Robert J.},
     title = {Refinement {Conditions} on {Operations} in {Sample} {Spaces}},
     journal = {Canadian journal of mathematics},
     pages = {991--999},
     year = {1975},
     volume = {27},
     number = {5},
     doi = {10.4153/CJM-1975-103-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-103-8/}
}