1. Bowie, M. J., Simpson, P. R., Rice, C. M., Jones, M. J., Proc. of 4th Int. Geochemical Exploration Symp., London 1972.
2. Geological analysis by track-etch-method;Liehu;Nucl. Instrum. Meth.,1977
3. Liehu, A. E., (1979), Licentiate thesis, University of Helsinki.
4. Nucelar tracks of 235U and distribution of uranium in geologic samples;Rehtijärvi;Geologi,1977
5. Rehtijärvi, P., Aikäs, O., (1977), Analysis of apatite- and uranium-bearing geological samples by phosphate stain printing and alpha-autoradiography.