[1]
M. Moosa Gabeleh, P. Moshokoa, and C. Vetro, “Cyclic (noncyclic) phi-condensing operator and its application to a system of differential equations”, NAMC, vol. 24, no. 6, pp. 985–1000, Nov. 2019, doi: 10.15388/NA.2019.6.8.