Donner, K. (1982). Extension of positive operators and Korovkin theorems. Springer-Verlag.
Chicago Edition CitationDonner, Klaus. Extension of Positive Operators and Korovkin Theorems. New York: Springer-Verlag, 1982.
MLA Edition CitationDonner, Klaus. Extension of Positive Operators and Korovkin Theorems. Springer-Verlag, 1982.
Warning: These citations may not always be 100% accurate.