@article{ZNSL_2011_395_a7,
     author = {Kh. D. Ikramov},
     title = {Products of orthoprojectors and a~theorem of {Crimmins}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {75--85},
     publisher = {mathdoc},
     volume = {395},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_395_a7/}
}