Bjelica, Momčilo. “On Inequalities for Indefinite Form”. Anal. Numér. Théor. Approx. 19, no. 2 (August 1, 1990): 105–109. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no2-art2.