@article{ZNSL_1968_8_a11,
     author = {B. A. Kushner and G. S. Tseitin},
     title = {Some properties of $F$-numbers},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {107--120},
     publisher = {mathdoc},
     volume = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a11/}
}