@article{IVM_2006_8_a1,
     author = {V. P. Derevenskii},
     title = {Hyperbolic functions and first-order nonlinear ordinary differential equations over a {Banach} algebra},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {7--18},
     publisher = {mathdoc},
     number = {8},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2006_8_a1/}
}