TY - Generic T1 - Alternative mathematics: the vague way. Y1 - 2000 A1 - Van Bendegem, Jean Paul ED - Krause, Décio ED - French, Steven ED - Doria, Francisco A. JA - Festschrift in honor of Newton C.A. da Costa on the occasion of his seventieth birthday PB - Kluwer Academic VL - 125 SP - 19–31 SN - N/A ER -