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@article{IVM_1968_4_a4, author = {V. A. Dem'yanenko}, title = {The indeterminate equations $x^6+y^6=az^2$, $x^6+y^6=az^3$, $x^4+y^4=az^4$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {26--32}, publisher = {mathdoc}, number = {4}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_4_a4/} }
V. A. Dem'yanenko. The indeterminate equations $x^6+y^6=az^2$, $x^6+y^6=az^3$, $x^4+y^4=az^4$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1968), pp. 26-32. http://geodesic.mathdoc.fr/item/IVM_1968_4_a4/