@article{AA_2014_26_1_a0,
     author = {A. P. Alekhin and Yu. V. Volkov and A. I. Generalov},
     title = {The {Hochschild} cohomology ring for modular group},
     journal = {Algebra i analiz},
     pages = {3--39},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2014_26_1_a0/}
}