APA (7th ed.) Citation

Sigstam, K. N. (2004). On an Inequality of M. Essén. Complex variables, theory & application, 49(7-9), 657-661. https://doi.org/10.1080/02781070410001732179

Chicago Style (17th ed.) Citation

Sigstam, Kibret Negussie. "On an Inequality of M. Essén." Complex Variables, Theory & Application 49, no. 7-9 (2004): 657-661. https://doi.org/10.1080/02781070410001732179.

MLA (9th ed.) Citation

Sigstam, Kibret Negussie. "On an Inequality of M. Essén." Complex Variables, Theory & Application, vol. 49, no. 7-9, 2004, pp. 657-661, https://doi.org/10.1080/02781070410001732179.