Brodsky L.I. e.a., 1992
Brodsky, L.I., Vassilyev, A.V., Kalaydzidis, Ya.L., Osipov, Yu.S., Tatuzov, R.L., Feramchuk, S.I. ( 1992 ) In: "DIMACS series in discrete mathematics and theoretical computer science". 8, 127-139.
Brodsky, L.I., Vassilyev, A.V., Kalaydzidis, Ya.L., Osipov, Yu.S., Tatuzov, R.L., Feramchuk, S.I. ( 1992 ) In: "DIMACS series in discrete mathematics and theoretical computer science". 8, 127-139.