@article{MZ_1968__106_171011,
     author = {Marvin W. Grossman},
     title = {An {Extremal} {Property} for {Certain} {Spaces} of {Lower} {Semi-continuous} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {139--148},
     publisher = {mathdoc},
     volume = {106},
     year = {1968},
     zbl = {0159.18003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171011/}
}