TY - GEN PB - Macmillan & Co. L1 - http://cybra.lodz.pl/Content/6586/N_v147_no3721_1941.pdf L2 - http://cybra.lodz.pl/Content/6586 T1 - Nature : a weekly illustrated journal of science vol. 147 no. 3721 (1941) UR - http://cybra.lodz.pl/dlibra/docmetadata?id=6586 ER -