@article{AIHPA_1986__45_3_327_0, author = {Gudder, Stanley}, title = {Logical cover spaces}, journal = {Annales de l'I.H.P. Physique th\'eorique}, pages = {327--337}, publisher = {Gauthier-Villars}, volume = {45}, number = {3}, year = {1986}, mrnumber = {868530}, zbl = {0612.03026}, language = {en}, url = {http://archive.numdam.org/item/AIHPA_1986__45_3_327_0/} }