@article{MZ_1988__198_3_173921,
     author = {C. Ionesco Tulcea},
     title = {On the {Approximation} of {Hausdorff} {Upper} {Semi-Continuous} {Correspondences.}},
     journal = {Mathematische Zeitschrift},
     pages = {207--220},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {1988},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__198_3_173921/}
}