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Distance functions were initially defined on the input or output production possibility sets by Shephard (1953, 1970) and extended to a graph representation of the technology by Fare, Grosskopf and ...
K. O. Friedrichs, Nonlinear Hyperbolic Differential Equations for Functions of Two Independent Variables, American Journal of Mathematics, Vol. 70, No. 3 (Jul., 1948 ...
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