1. The question of the chemical structure of amber;Alekseeva;Khim. Prir. Soedin.,1966
2. Infra-red spectra and the origin of amber;Beck;Nature (London),1964
3. The infrared spectra of amber and the identification of Baltic amber;Beck;Archaeometry,1965
4. The provenience of archaeological amber artifacts, Part 1. 8th century B.C. to 1899;Beck;Art Archaeol. Tech. Abstr.,1966
5. The provenience of archaeological amber artifacts, Part 2, 1900 to 1966;Beck;Art Archaeol. Tech. Abstr.,1967