@article{DMDICO_2002_22_1_a2,
     author = {Ginchev, Ivan and Hoffmann, Armin},
     title = {Approximation of set-valued functions by single-valued one},
     journal = {Discussiones Mathematicae. Differential Inclusions, Control and Optimization},
     pages = {33--66},
     year = {2002},
     volume = {22},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMDICO_2002_22_1_a2/}
}