Citation: Shepelev, Yu.F.; Lapshin, A.E.; Petrova, M.A.; Novikova, A.S. (2002). Crystal structures of Na2 Zn P2 O7, K2 Zn P2 O7 and Li K Zn P2 O7 phases in the (M2 O) - (Zn O) - (P2 O5) glass-forming system (M = Li, Na and K). Glass Physics and Chemistry, 28, pp. 317-321.