@article{1093887923,
author = {Wilson, Robert L.},
title = {The modal predicate logics ${\bf PF}^*{\bf F}$.},
journal = {Notre Dame J. Formal Logic},
volume = {18},
number = {1},
year = {1977},
pages = { 208-220},
language = {en},
url = {http://dml.mathdoc.fr/item/1093887923}
}
Wilson, Robert L. The modal predicate logics ${\bf PF}^*{\bf F}$.. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 208-220. http://gdmltest.u-ga.fr/item/1093887923/