@article{10_4064_fm_124_3_221_233,
     author = {Claudio Bernardi and Franco Montagna},
     title = {Equivalence relations induced by extensional formulae: classification by means of a new fixed point property},
     journal = {Fundamenta Mathematicae},
     pages = {221--233},
     publisher = {mathdoc},
     volume = {124},
     number = {3},
     year = {1984},
     doi = {10.4064/fm-124-3-221-233},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-124-3-221-233/}
}