@article{PHSC_2004__8_2_39_0,
     author = {Keiff, Laurent},
     title = {Heuristique formelle et logiques modales non-normales},
     journal = {Philosophia Scientiae},
     pages = {39--57},
     publisher = {\'Editions Kim\'e},
     volume = {8},
     number = {2},
     year = {2004},
     language = {fr},
     url = {http://www.numdam.org/item/PHSC_2004__8_2_39_0/}
}