@article{10_4064_ap_56_2_133_142,
     author = {F. De Blasi and G. Pianigiani},
     title = {On the density of extremal solutions of differential inclusions},
     journal = {Annales Polonici Mathematici},
     pages = {133--142},
     publisher = {mathdoc},
     volume = {56},
     number = {2},
     year = {1991},
     doi = {10.4064/ap-56-2-133-142},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-56-2-133-142/}
}