A study of a family of generating functions of Nelsen-Schmidt type and some identities on restricted barred preferential arrangements. - Sithembele Nkonkobe; Venkat Murali (Discret. Math., 2017)

A combinatorial analysis of higher order generalised geometric polynomials: A generalisation of barred preferential arrangements. - Sithembele Nkonkobe; Beáta Bényi; Roberto B. Corcino; Cristina B. Corcino (Discret. Math., 2020)

Combinatorial approach of unified Apostol-type polynomials using α-distanced words. - Beáta Bényi; Sithembele Nkonkobe (Discret. Appl. Math., 2024)