@article{RM_1970_25_5_a10,
     author = {A. P. Norden and N. M. Ostianu and V. V. Ryzhkov},
     title = {German {Fedorovich} {Laptev} (on his sixtieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {239--244},
     publisher = {mathdoc},
     volume = {25},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_5_a10/}
}