@article{RM_1970_25_5_a9,
     author = {A. A. Dorodnitsyn and M. A. Lavrent'ev and L. A. Lyusternik and A. P. Prudnikov},
     title = {Vitalii {Arsen'evich} {Ditkin} (on his sixtieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {233--238},
     publisher = {mathdoc},
     volume = {25},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_5_a9/}
}