@article{IVM_1965_5_a6,
     author = {V. A. Dem'yanenko},
     title = {On {Ye\'smanowicz'} problem for {Pythagorean} numbers},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {52--56},
     year = {1965},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1965_5_a6/}
}