@article{DAN_1965_162_3_a3,
     author = {D. F. Davidenko},
     title = {The application of the method of the variation of a parameter to the construction of iteration formulae 
},
     journal = {Doklady Akademii Nauk},
     pages = {499--502},
     publisher = {mathdoc},
     volume = {162},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_162_3_a3/}
}