← Search Econometrica Vol. 36 No. 2 1968 Cours d'Automatique Theorique Karl Shell; R. Pallu de la Barriere DOI10.2307/1907506 Volume36 Issue2 Pages430 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 ✓