@article{MZM_1978_23_3_a10,
     author = {N. V. Grigorenko},
     title = {$G$-primitive extensions of differential fields},
     journal = {Matemati\v{c}eskie zametki},
     pages = {425--434},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_3_a10/}
}