@article{ZNSL_1974_47_a14,
     author = {V. G. Kulakova},
     title = {Positive projections and conditional mathematical expectations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--174},
     year = {1974},
     volume = {47},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_47_a14/}
}