1. Accumulation of lead in tree trunk bark pockets as pollution time capsules
2. 3) K. Satake, A. Tanaka, T. Takamatsu, K. Kimura: Proceedings of the International Workshop on Development and Application of Biogiochemical Methods in Acid Rain Reserch, p. 151 (1993), Tsukuba and Kusatsu.
3. 4) K. Satake, R. Idegawa, M. Ohata, N. Furuta: Proceedings of 5th International Conference on the Biogeochemistry of Trace Elements, p. 1074 (1999), Vienna.
4. Laser Ablation