Citation: Bao Songsong; Wang Tianwei; Li Yizhi; Zheng Limin (2006). Metal phosphonates based on aminomethylenediphosphonate: syntheses and characterization of Na4 Zn {N H3 C H (P O3)2}2.4H2 O, Ni {N H3 C H (P O3 H)2}2.xH2 O and Na Ni2 {N H3 C H (P O3) (P O3 H0.5)}2 (H2 O)2.2H2 O. Journal of Solid State Chemistry, 179, pp. 413-420.