Pavlov, Alexander, Ulrich Pennig, and Thomas Schick. “Quasi-Multipliers of Hilbert and Banach $C^*$-Bimodules”. Mathematica Scandinavica 109, no. 1 (September 1, 2011): 71–92. Accessed September 8, 2026. https://journals.msp.org/mscand/article/view/519.