Ahmad, I, Austin, SM, Back, BB, Betts, RR, Calaprice, FP, Chan, KC, Chishti, A, Chowdhury, P, Conner, C, Dunford, RW, Fox, JD, Freedman, SJ, Freer, M, Gazes, S, Hallin, AL, Happ, T, Kaloskamis, N, Kashy, E, Kutschera, W, Last, J, Lister, CJ, Liu, M, Maier, MR, Mercer, DJ, Mikolas, D, Perera, A, Rhein, MD, Roa, E, Schiffer, JP, Trainor, T, Wilt, P, Winfield, JS, Wolanski, M, Wolfs, FLH, Wuosmaa, AH, Young, A & Yurkon, JE 1996, '
The positron peak puzzle - Recent results from apex the apex collaboration',
Acta Physica Polonica B, vol. 27, no. 1-2, pp. 387-400.