@ARTICLE{MR571759,
   AUTHOR       = {E.D. Sontag},
   JOURNAL      = {IEEE Trans. Automat. Control},
   TITLE        = {On generalized inverses of polynomial and other matrices},
   YEAR         = {1980},
   OPTMONTH     = {},
   OPTNOTE      = {},
   NUMBER       = {3},
   PAGES        = {514--517},
   VOLUME       = {25},
   PDF          = {../../FTPDIR/wgi.pdf},
   ABSTRACT     = { Necessary and sufficient conditions are given for a 
      matrix over a ring to admit a Moore-Penrose generalized inverse in a 
      weak sense. (Attached is also a Math Review with additional comments 
      on strong inverses.) }
}

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