Full paper in PDF:
     
  $%  R.  Grząślewicz,  Symmetric  stochastic  matrices  with  given  row  sums,
     Rev. Mat. Univ. Complut. Madrid 3 (1990), no. 1, 43–56.%$
 
Symmetric Stochastic Matrices with Given Row Sums
     Characterizations of extreme infinite symmetric stochastic matrices with respect
     to arbitrary non-negative vector 
     
 are given.
     
1980 Mathematics Subject Classification (1985 revision): 47D20, 52A05.