Duca, D. I., and I. M. Stancu-Minasian. “Mathematical Programming in Complex Space: A Comprehensive Bibliography”. Anal. Numér. Théor. Approx., vol. 17, no. 2, Aug. 1988, pp. 133-40, https://ictp.acad.ro/jnaat/journal/article/view/1988-vol17-no2-art5.