1. R. F. Welton, Proceedings of LINAC 2002, Gyeongju, Korea, 2002 (unpublished), p. 559.
2. Yu. Belchenko, G. Dimov, and V. Dudnikov, Proceedings of the Symposium on Production and Neutralization of Negative Hydrogen Ions and Beams, Brookhaven National Laboratory Report No. BNL 50727, 1977, 79.
3. Multiampere negative ion source development at Novosibirsk (invited)
4. Spatial distributions of the emitting species in a Penning surface‐plasma source