@article{MZM_1983_34_6_a1,
     author = {Yu. V. Kuz'min},
     title = {Group of extensions and the functor {Ext} in the variety~$\mathfrak R_C$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {811--820},
     publisher = {mathdoc},
     volume = {34},
     number = {6},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_6_a1/}
}