1. Univ. Math. Monogr.;N. Akhiezer,1965
2. [A1] Alpern, S.: Approximation to and by measure preserving homeomorphisms. J. Lond. Math. Soc.18, 305?315 (1978)
3. [AP] Atiyah, M.F., Pressley, A.N.: Convexity and loop groups. In: Artin, M., Tate, J. (eds.) Arithmetic and Geometry: papers dedicated to I.R. Shafarevich on the occasion of his sixtieth birthday, vol. 2. Boston Basel Stuttgart: Birkhaüser 1983
4. Contemp. Math.;D. Bao,1992
5. [Bi] Birkhoff, G.: Three observations on linear algebra. Rev. Univ. Nac. Tucumán, Ser. A5, 147?151 (1946) (we have only seen the Math. Reviews summary of this paper)