1. Destruction of Organic Matter;Gorsuch,1970
2. Trace Element Analysis in Biological Specimens;Sansoni,1994
3. Sampling and Sample Preparation Methods for the Analysis of Trace Elements in Biological Materials;Sansoni,1978
4. Sampling and Sample Preparation Methods for the Analysis of Trace Elements in Biological Materials;Sansoni;IAEA Technical Reports Series No. 197, Vienna,1980