@article{ZNSL_1968_8_a9,
     author = {B. A. Kushner},
     title = {Some examples of quasidense, but not dense sets of duplexes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {95--102},
     publisher = {mathdoc},
     volume = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a9/}
}