1. ATOMIKA, Technische Physik GmbH, D-8000 München 19.
2. Secondary ion mass spectrometry, special publication 427;Heinrich,1975
3. Proc. of the 7th Int. Vac. Congr. and the 3rd Int. Conf. on Solid surfaces;Wittmaack,1977
4. Cefilac, Joints Fargère Industrie, F-42029 Saint-Etienne.