7 . ▁D z hum ad ild ae v ▁A . S . ▁O dd ▁central ▁extensions ▁of ▁Lie ▁super al gebras ▁// ▁Function al ▁Analysis ▁and ▁its ▁App lications . ▁– ▁ 1 9 9 5 . ▁– ▁V . 2 9 , ▁No . 3 . ▁– ▁P . 2 0 2 – 2 0 4 . ▁D z hum ad ild ae v ▁A . S . ▁D iffer enti ations ▁and ▁central ▁extensions ▁of ▁Lie ▁algebra ▁of ▁formal ▁pseudo - d iffer ential ▁operators ▁// ▁Al gebra ▁i ▁An alis , ▁{\ bf ▁ 6 }( 1 9 9 4 ), ▁No . 1 , ▁p .   1 4 0 - 1 5 8 = engl . trans l . ▁St . P eters bourg ▁Math . J . ▁{\ bf ▁ 6 }( 1 9 9 5 ), ▁No . 1 , ▁p .   1 2 1 - 1 3 6 . ▁D z hum ad ild ae v ▁A . S . ▁Central ▁extensions ▁of ▁infinite - dimensional ▁Lie - al gebras ▁// ▁Function al ▁Analysis ▁and ▁its ▁App lications . ▁– ▁ 1 9 9 2 . ▁– ▁V . ▁ 2 6 , ▁No . 4 . ▁– ▁P . 2 4 7 – 2 5 3 . ▁D z hum ad ild ae v ▁A . S . ▁C oh om ology ▁of ▁trunc ated ▁co indu ced ▁representations ▁of ▁Lie - al gebras ▁of ▁positive ▁characteristic ▁// ▁Mathemat ics ▁of ▁the