Spacer-armed derivatives of 5-pyridine-2-yl-1,2,4-triazole as additional ligands for Eu(III) and Sm(III) dibenzoylmethanates - A. N. Gusev; V. F. Shulgin; G. A. Nishchimenko; A. V. Kirijak; S. B. Meshkova (Ukrainian Chemistry Journal, 2012)