Nil Bohr-Sets and Almost Automorphy of Higher Order:
Wen Huang
... Dynamical systems and ergodic theory, to VIVIANE BALADI, Analyse
Algébrique, Institut de Mathématiques de Jussieu-Paris Rive Gauche, U.P.M.C.,
B.C. 247, 4 Place Jussieu, F 75252 Paris cedex 05, France; e-mail: ...