@article{SF_1994__49_2_135353,
     author = {J.S. Ponizovski{\"\i}},
     title = {Evgeni{\"\i} {Sergejevich} {Lyapin} on his 80th birthday.},
     journal = {Semigroup forum},
     pages = {271--274},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0805.01026},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135353/}
}