@misc{_Nature_1921,
 year={1921},
 rights={Domena publiczna (Public domain)},
 publisher={Macmillan and Co.},
 language={eng},
 type={czasopismo},
 title={Nature : a Weekly Illustrated Journal of Science. Volume 107, 1921 April 21, [ No. 2686]},
 keywords={nauki matematyczno-przyrodnicze, nauka},
}