Milovanović, Igor Ž., et al. “Properties of Bounded Convex Sequences”.
Anal. Numér. Théor. Approx.
, vol. 19, no. 1, Feb. 1990, pp. 53-58,
https://ictp.acad.ro/jnaat/journal/article/view/1990-vol19-no1-art9
.