Inter-laboratory validation of the WDXRF, EDXRF, ICP–MS, NAA and PGAA analytical techniques and geochemical characterisation of obsidian sources in northeast Hokkaido Island, Japan / Y. Suda, A. V. Grebennikov, Y. V. Kuzmin [et al.] // Journal of archaeological science: reports. 2018. Vol. 17. P. 379-392. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000673067