1. Proc. Symp. Ion sources and formation of ion beams;Clegg,1971
2. Proc. Symp. Ion sources and formation of ion beams;McKibben,1971
3. Proc. Symp. Ion sources and formation of ion beams;Sanada,1971
4. presented at Symp. Ion sources and formation of ion beams;Bacal,1971
5. M. Bacal and W. Reichelt, CEA, French Patent EN 7137448 (Oct. 1971).