La. Bunimovich et J. Rehacek, ON THE ERGODICITY OF MANY-DIMENSIONAL FOCUSING BILLIARDS, Annales de l'I.H.P. Physique theorique, 68(4), 1998, pp. 421-448
The affirmative answer is given to the long standing question whether
there exist nowhere dispersing ergodic billiards in dimensions greater
than two. To do this we construct a class of n-dimensional domains, n
greater than or equal to 3, generating ergodic billiards (that are al
so Bernoulli systems). (C) Elsevier, Paris.