@article{04115507, title = {A topological lattice on the set of multifunctions.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {12}, year = {1989}, pages = {665-668}, doi = {10.1155/S0161171289000815}, zbl = {0681.54010}, language = {en}, url = {http://dml.mathdoc.fr/item/04115507} }
Papadopoulos, Basil K. A topological lattice on the set of multifunctions.. International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 665-668. doi : 10.1155/S0161171289000815. http://gdmltest.u-ga.fr/item/04115507/