[MathCongrès]
Discrete groups and geometric structures
/ Ed. Dekimpe, Karel ; Ed. Igodt, Paul ; Ed. Valette, Alain.
-Providence RI : American mathematical Society, 2009. - xi, 146 p. ; 26 cm
ISBN 9780821846476
[MathCongrès]
Crystallographic groups and their generalizations
/ Ed. Igodt, Paul ; Ed. Abels, Herbert ; Ed. Félix, Yves ; Ed. Grunewald, Fritz.
-Providence RI : American mathematical Society, 2000. - xv, 310 p. ; 26 cm