@article{IM2_1991_36_1_a0,
     author = {\`E. B. Vinberg},
     title = {On certain commutative subalgebras of a universal enveloping algebra},
     journal = {Izvestiya. Mathematics },
     pages = {1--22},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_36_1_a0/}
}