Thermal desorption of cold positronium from oxygen-treated Al(111) surfaces, Mills AP, Shaw ED, Leventhal M, Chichester RJ, Zuckerman DM, Physical Review B, Volume 44, Number 11, pp. 5791-5799 , 9/15/1991
Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization, Fee MS, Mills AP, Shaw ED, Chichester RJ, Zuckerman DM, Chu S, Danzmann K, Physical Review A, Volume 44, Number 11, pp. R5-R8 , 7/1/1991
Positron-reemission-microscope study of positron implantation and diffusion, Mills AP, Brandes GR, Canter KF, Physical Review B, Volume 43, Number 13, pp. 103-110, 5/1/1991
Evidence for Quantum Sticking of Slow Positronium, Mills AP, Shaw ED, Leventhal M, Platzman PM, Chichester RJ, Zuckerman DM, Martin T, Bruinsma R, Lee RR, Physical Review Letters, Volume 66, Number 6, pp. 735-738, 2/11/1991