TY - JOUR AU - Almond, D. J. TI - Time operators, position operators, dilatation transformations and virtual particles in relativistic and nonrelativistic quantum mechanics JO - Annales de l'I.H.P. Physique théorique PY - 1973 SP - 105 EP - 169 VL - 19 IS - 2 PB - Gauthier-Villars UR - http://geodesic.mathdoc.fr/item/AIHPA_1973__19_2_105_0/ LA - en ID - AIHPA_1973__19_2_105_0 ER -