@article{AA_1990_2_2_a2,
     author = {F. G. Malikov},
     title = {Verma modules over {Kac{\textendash}Moody} algebras of rank~2},
     journal = {Algebra i analiz},
     pages = {65--84},
     year = {1990},
     volume = {2},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1990_2_2_a2/}
}