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3. Ashirov, A., Rumanova, I.M., Belov, N.V.: Crystalline structure of lesserite Mg[B3O3(OH)5]·5H2O. Dokl. Akad. Nauk SSSR 143, 331?334 (1962a, in Russian)
4. Ashirov, A., Rumanova, I.M., Belov, N.V.: The crystal structure of hydroboracite CaMgB6O11·6H2O = CaMg[B3O4(OH)3]2·3H2O. Dokl. Akad. Nauk SSSR 147, 1079?1082 (1962b, in Russian)
5. Ashmore, J.P., Petch, H.E.: Hydrogen positions in potassium pentaborate tetrahydrate. Can. J. Phys. 48, 1091?1097 (1970)