Books by Stefan Krasa:
Books in the extended shelves:
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Krasa, Stefan: Non-existence and inefficiency of equilibria with American options and convertiblle bonds (College of Commerce and Business Administration, University of Illinois at Urbana-Champaign, 1990), also by Charles M. Kahn and University of Illinois at Urbana-Champaign. College of Commerce and Business Administration (page images at HathiTrust)
Find more by Stefan Krasa at your library, or elsewhere.