Sharma, N., A. Aggarwal, and R. Sharma. “BIFRAMES AND THEIR PROPERTIES IN QUATERNIONIC HILBERT SPACES”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 20, no. 4, Aug. 2026, pp. 2743-54, doi:10.30598/barekengvol20iss4pp2743-2754.