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Extensions of positive-definite functions / [by] John McMullen
[Providence, R.I. : American Mathematical Society , 1972]. - (Memoirs of the American Mathematical Society ; no. 117)
Books
The approximation of continuous functions by positive linear operators / Ronald A. DeVore
: Germany,: U.S.. - Berlin ; New York : Springer-Verlag , 1972. - (Lecture notes in mathematics ; v. 293)