Crystal structure of bis(4,4'-bipyridinium) bis(imidazolium) hexanitratostrontium(II) bis(imidazolate) — imidazole —water (1:2:1), [C10H10N2]2[C3H5N2]2[Sr(NO3)6][C3H3N2]2 · 2C3H4N2 · H2O - Bi, Wenyan; Guanghua, Li; Xue, Qing; Huo, Yu; Wang, Gaopeng (Zeitschrift für Kristallographie. New crystal structures, 2011)