← Search Econometrica Vol. 40 No. 2 1972 Nonlinear Programming: A Unified Approach David W. Peterson; Willard I. Zangwill DOI10.2307/1909424 Volume40 Issue2 Pages411 Sources semanticscholar openalex crossref Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓