@article{ZNSL_1984_140_a4,
     author = {V. B. Philippov and A. B. Zayaev},
     title = {Rigorous justification of the {Friedlander{\textendash}Keller} formulas},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {49--60},
     year = {1984},
     volume = {140},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a4/}
}