1. Chelatometric determination of aluminium
2. Scott, W.W. “Standard Methods of Chemical Analysis, Vol. 1, p. 466, 5th edn, Technical Press Ltd, London (1958).
3. Separation of titanium from iron and aluminium
4. Voinovitch, I.A., Guedon Defres and Louvriec, J.The Analysis of Silicates, pp. 250, 252 Israel Programme for Scientific Translation Ltd, Israel (1966).