[1]

J. Cuntz. The K-groups for free products of C*-algebras. In R.V. Kadison, editor, Operator Algebras and Applications, pages 81-84, Kingston, 1980, 1981. Proc. Sympos. Pure Math., volume 38, part 1.

[2]

S. Eilers, T.A. Loring, and G.K. Pedersen. Stability of anticommutation relations. An application of noncommutative CW complexes. J. reine angew. Math., 499:101-143, 1998.

[3]

R. Exel and T.A. Loring. Invariants of almost commuting unitaries. J. Funct. Anal., 95:364-376, 1991.

[4]

R. Exel. Rotation numbers for automorphisms of C*-algebras. Pacific J. Math., 127(1):31-89, 1987.

[5]

R. Exel. The soft torus and applications to almost commuting matrices. Pacific J. Math., 160:207-217, 1993.

[6]

R. Exel. The soft torus: a variational analysis of commutator norms. J. Funct. Anal., 126(2):259-273, 1994.

[7]

C. Farsi. Soft non-commutative toral C*-algebras. Preprint, 1995.

[8]

H. Lin. Approximation by normal elements with finite spectra in C*-algebras of real rank zero. Pacific J. Math., 173(2):443-489, 1996.

[9]

T.A. Loring. Stable relations II: Corona semiprojectivity and dimension-drop C*-algebras. Pacific J. Math., 172:461-475, 1996.

[10]

T.A. Loring. Lifting solutions to perturbing problems in C*-algebras, volume 8 of Fields Institute Monographs. American Mathematical Society, Providence, RI, 1997.

[11]

T.A. Loring. Perturbation questions in the Cuntz picture of K-theory. K-Theory, 11(2):161-193, 1997.

[12]

N.C. Phillips. Exponential length and traces. Proc. Roy. Soc. Edinburgh Sect. A, 125(1):13-29, 1995.

[13]

M.A. Rieffel. C*-algebras associated with irrational rotations. Pacific J. Math., 93(2):415-429, 1981.