TY - JOUR AU - Bachelot, Alain TI - Global Waves with Non-Positive Energy in General Relativity JO - Serdica Mathematical Journal PY - 2008 SP - 127 EP - 154 VL - 34 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SMJ2_2008_34_1_a5/ LA - en ID - SMJ2_2008_34_1_a5 ER -