#### Volume 7, issue 1 (2003)

 1 B Evans, J Maxwell, Quaternion actions on $S^{3}$, Amer. J. Math. 101 (1979) 1123 MR546306 2 H Hopf, Zum Clifford–Kleinschen Raumproblem, Math. Ann. 95 (1926) 313 MR1512281 3 R Lee, Semicharacteristic classes, Topology 12 (1973) 183 MR0362367 4 G R Livesay, Fixed point free involutions on the 3–sphere, Ann. of Math. $(2)$ 72 (1960) 603 MR0116343 5 J Milnor, Groups which act on $S^n$ without fixed points, Amer. J. Math. 79 (1957) 623 MR0090056 6 R Myers, Free involutions on lens spaces, Topology 20 (1981) 313 MR608603 7 P M Rice, Free actions of $Z_{4}$ on $S^{3}$, Duke Math. J. 36 (1969) 749 MR0248814 8 G X Ritter, Free $Z_{8}$ actions on $S^{3}$, Trans. Amer. Math. Soc. 181 (1973) 195 MR0321078 9 J H Rubinstein, On 3–manifolds that have finite fundamental group and contain Klein bottles, Trans. Amer. Math. Soc. 251 (1979) 129 MR531972 10 J H Rubinstein, Free actions of some finite groups on $S^{3}$ I, Math. Ann. 240 (1979) 165 MR524664 11 P Scott, The geometries of 3–manifolds, Bull. London Math. Soc. 15 (1983) 401 MR705527 12 W Threlfall, H Seifert, Topologische Untersuchung der Diskontinuitätsbereiche endlicher Bewegungsgruppen des dreidimensionalen sphärischen Raumes, Math. Ann. 104 (1931) 1 MR1512649 13 W P Thurston, Three-dimensional geometry and topology Vol. 1, Princeton Mathematical Series 35, Princeton University Press (1997) MR1435975 14 C B Thomas, Elliptic structures on 3–manifolds, London Mathematical Society Lecture Note Series 104, Cambridge University Press (1986) MR861414 15 J A Wolf, Spaces of constant curvature, Publish or Perish (1984) MR928600