SYNTHESIS AND CRYSTAL STRUCTURE OF [NA(H2O)4] [EUL4] · 0.775CH2CL2 (HL = 1,3-BIS 1,3-DIMETHYL-1H-PYRAZOL-4-YL)-1,3-PROPANEDIONE) Article Taydakov I.V., Zaitsev B.E., Krasnosel'sky S.S., Polyakova I.N., Sergienko V.S. Russian Journal of Inorganic Chemistry. IAPC Nauka/Interperiodica. Vol. 56. 2011. P. 345-349