References
- De Quervain, A., Brown Boveri Review, 41 (7/8), 1955.
- Pia, G. F., Brown Boveri Review, 46 (4), 1959.
- Quervain De, A., Brown Boveri Review, 46 (11/12) (1959).
- Guaneela, G., Brown Boveri Review, 46 (11/12), 1959.
- Brown Boveri Bulletin, 621, 398; 216, 317.