American Institute of Physics
J.G. Alessi , A. Hershcovitch

Heeren, R., de Graaf, M. J., Meyler, D. B., Ciric, D., Hopman, H. J., & Kleyn, A. W. (1994). Sputtering in surface conversion negative ion sources. In J. G. Alessi & A. Hershcovitch (Eds.), Production and Neutralization of Negative Ions and Beams : Sixth International Symposium, Upton, NY November 1992 (pp. 3–15).