Tome 19 (1973) no. 2

Sommaire

Time operators, position operators, dilatation transformations and virtual particles in relativistic and nonrelativistic quantum mechanics
p. 105-169
On integrability of discrete representations of Lie algebra u(p,q)
p. 171-177
Spin and the structure of space-time
p. 179-196
Bianchi universes admitting full groups of motions
p. 197-210