1. A. M. Vershik, “Uniform algebraic approximation of the shift and multiplication operators,” Dokl. Akad. Nauk SSSR,259, No. 3, 526–529 (1981).
2. M. Pimsner and D. Voiculescu, “Imbedding the irrational rotation C*-algebra into an AF-algebra,” J. Operator Theory,4, 201–210 (1980).
3. A. M. Vershik, “Countable groups which are close to finite groups,” in: F. P. Greenleaf, Invariant Means on Topological Groups [Russian translation], Mir, Moscow (1973).
4. A. M. Vershik, “Is the uniform algebraic approximation of the multiplication and convolution operators possible?.” J. Sov. Math.,26, No. 5 (1984).
5. M. A. Rieffel, “Irrational rotation of C*-algebras,” in: Internat. Congress Math., Helsinki (1978).