@article{DAN_1993_329_5_a4,
     author = {V. V. Kravchenko and M. V. Shapiro},
     title = {On a generalized system of {Cauchy{\textendash}Riemann} equations with a quaternion parameter},
     journal = {Doklady Akademii Nauk},
     pages = {547--549},
     year = {1993},
     volume = {329},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_329_5_a4/}
}