@article{PHSC_1998-1999__3_4_279_0, author = {de Jongh, Dick and van Ulsen, Paul}, title = {Beth's nonclassical valuations}, journal = {Philosophia Scientiae}, pages = {279--302}, publisher = {\'Editions Kim\'e}, volume = {3}, number = {4}, year = {1998-1999}, language = {en}, url = {http://www.numdam.org/item/PHSC_1998-1999__3_4_279_0/} }