1. Ortner HM, Wilhartitz P (1988) Final report COST 503/project A3. Metallwerk Plansee, Reutte, Austria
2. Aronsson B (1987) Powder metallurgy 30:175?179
3. Virag A (1988) Doctors thesis TU Wien, Institute of Analytical Chemistry
4. Goretzki H, Weiss M, Kny E (1984) Fresenius Z Anal Chem 319:826?829
5. Martin EJ, Tulhoff H (1987) Final report COST 503/project D37. Starck, Berlin