WeGA, Bibliographie, Digitale Edition
availability: Creative Commons Attribution 4.0 International (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0/)

Aleksandr Nikolaevic Serov, Preciosa i proc. Preciosa und anderes mehr, Izbrannye Stat'i, 2, Moskau, 1957, 440-444