1. 31Can: G. Canneri,Met. Ital., 23, 803 (1931).
2. 34Can: G. Canneri,Met. Ital., 26, 794 (1934).
3. 38Ian: A. Iandelli,Atti Congr. Intern. Chim. 10th Congr. Rome, 2, 688 (1938).
4. 43Bom: H. Bommer and E. Krose,Z. Anorg. Chem., 252, 62 (1943).
5. 43Vog: R. Vogel and T. Heumann,Z. Metallkd., 35, 29 (1943).