SYNTHESIS, CRYSTAL AND MOLECULAR STRUCTURE OF CATENA-(BIS(Μ1-OXALIC ACID)-Μ3-HYDROGEN OXALATE-DI-AQUA-SODIUM(I)) ArticleKovalchukova Olga, Aldoshin Sergey, Utenyshev Andrey, Bogenko Konstantin, Tkachev ValeriyCommunications in Inorganic Synthesis. Vol. 3. 2015. P.. 23-25