Eljazzar, R., M. Rossafi, and M. Klilou. “Some Properties of K-Operator Frame in Hilbert $C^{\ast}$-Modules”. Jurnal Matematika, Statistika Dan Komputasi, vol. 18, no. 3, May 2022, pp. 407-22, doi:10.20956/j.v18i3.20459.