Kodaka, K., and Y. Teruya. “Inclusions of Unital $C^*$-Algebras of Index-Finite Type With Depth 2 Induced by Saturated Actions of Finite Dimensional $C^*$-Hopf Algebras”. MATHEMATICA SCANDINAVICA, vol. 104, no. 2, June 2009, pp. 221-48, doi:10.7146/math.scand.a-15096.