Higher-genus corrections to black-string solution
  One-string-loop (torus topology) corrections to black-string backgrounds corresponding to gauged ${SL(2,R)\times R}/R$ WZW model are calculated using $\beta$-function equations derived from string-loop-corrected effective action. Loop-corrected backgrounds are used to calculate ADM mass of the black string. 
M.Z.Iofa (Nuclear Physics Institute, Moscow State University)