@article{DAN_1974_214_3_a0,
     author = {V. E. Balabaev},
     title = {A quaternion analog of the {Cauchy--Riemann} system in four-dimensional complex space and some of its applications},
     journal = {Doklady Akademii Nauk},
     pages = {489--491},
     publisher = {mathdoc},
     volume = {214},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_214_3_a0/}
}