1. Proc. Symp. on Radioactive Dating and Methods of Low-level Counting;Johnsen,1967
2. Proc. Symp. on Radioactive Dating and Methods of Low-Level Counting;Chwaszczewska,1967
3. Low background counting of betas and alphas with silicon detectors
4. Proc. Int. Conf. on Low-Radioactivity Measurements and Applications;Tykva,1975