Duca, Dorel I. “Necessary Optimality Criteria in Nonlinear Programming in Complex Space With Differentiability”. Anal. Numér. Théor. Approx. 9, no. 2 (August 1, 1980): 163–179. Accessed November 25, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1980-vol9-no2-art2.