1. Knick, R., Kohlmeyer, E.J., About the Melting Properties of the Soda-Iron Oxide Mixtures
(in German), Z. Anorg. Allg. Chem., 244, 67-84 (1940)
2. Collonques, R., Thery, J., Preparation and Properties of Sodium Ferrites, Bull. Soc.
Chim. Fr., 1959, 1141-1144 (1959)
3. Thery, J., Collongues, R., The Fe2O3-Na2O System (in
French), Compt. Rend., 250, 1070-1072 (1960)
4. Kuznetsov, V.G., Tokareva, S.A., Dobrolyubova, M.S., X-ray Diffraction Investigation of the Sodium
Ozonide NaO3 (in Russian), Zh. Neorg. Khim., 7(5), 967-970 (1962)
5. Rooymans, C.J.M., New Compound in the Na2O-Fe2O3 System,
J. Phys. Soc. Jpn., 17, 722-723 (1962)