@article{AA_1994_6_1_a6,
     author = {A. S. Dzhumadil'daev},
     title = {Derivations and central extensions of the {Lie} algebra of formal pseudodifferential operators},
     journal = {Algebra i analiz},
     pages = {140--158},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1994_6_1_a6/}
}