← Search Econometrica Vol. 37 No. 1 1969 An Harmonic Analysis of Nonstationary Multivariate Economic Processes David R. Brillinger; Michio Hatanaka DOI10.2307/1909211 Volume37 Issue1 Pages131 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 ✓