Dec 01 2001 Yasuhito Tanaka   Generalized monotonicity and strategy-proofness for non-resolute social choice correspondences   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   Oct 10 2001 Yasuhito Tanaka   Generalized monotonicity and strategy-proofness: A note   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result