← Search Econometrica Vol. 21 No. 4 1953 Nonnegative Square Matrices Gerard Debreu; I. N. Herstein DOI10.2307/1907925 Volume21 Issue4 Pages597 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 ✓