WANAS, A. K. A CERTAIN SUBCLASS OF MULTIVALENT ANALYTIC FUNCTIONS WITH NEGATIVE COEFFICIENTS FOR OPERATOR ON HILBERT SPACE. Journal of the Indonesian Mathematical Society, [S. l.], v. 21, n. 2, p. 77–82, 2015. DOI: 10.22342/jims.21.2.228.77-82. Disponível em: http://jims-a.org/index.php/jimsa/article/view/228. Acesso em: 5 jul. 2022.