@misc{_Nature_1920, year={1920}, rights={Domena publiczna (Public domain)}, publisher={Macmillan and Co.}, description={brak nr 2669, 2670, 2677}, language={eng}, title={Nature : a Weekly Illustrated Journal of Science. Volume 106, 1920 December 16, [No. 2668]}, type={czasopismo}, keywords={nauki matematyczno-przyrodnicze, nauka}, }