@misc{VMUMM_1991_5_a1,
     title = {Chebyshev {Lectures} 1990/91 academic year},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {5--6},
     year = {1991},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_5_a1/}
}