Laser spectroscopy of metastable states in the υ=2 cascade of antiprotonic 3He - Hartmann,FJ; Ketzer,B; Maierl,C; Pohl,R; von,Egidy T; Hayano,RS; Hori,M; Ishikawa,T; Tamura,H; Torii,HA; Kumakura,M; Morita,N; et al. (PHYSICAL REVIEW A, 1998)