← Search Management Science 1986 Inventory service-level measures: convexity and approximation ZipkinP DOI10.5555/9579.9584 Sources semanticscholar openalex 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 ✓