Netreba, E. E. Synthesis and Investigation of Molecular and Crystal Structure of Coordination Polymer of Neodime nitrate(III) With 4,4,10,10-Tetramethyl-1,3,7,9-tetraazospiro[5.5]undecan-2,8-Dion (spirocarbon – SK). Khark. Univ. Bull. Chem. Ser. 2012, 319-326.