On $C^*$-algebra extensions relative to a factor of type $\mathrm{II}_\infty$

Elliot, G. A., & Takemoto, H. (1983). On $C^*$-algebra extensions relative to a factor of type $\mathrm{II}_\infty$. MATHEMATICA SCANDINAVICA, 53, 245–255. https://doi.org/10.7146/math.scand.a-12032