1. BLACKMAN, M, THE CUBIC AND OTHER STRUCTURAL FORMS OF ICE AT LOW TEMPERATURE AND PRESSURE, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES 239: 93 (1957).
2. BRIDGMAN, P.W., Water, in the liquid and five solid forms, under pressure, PROCEEDINGS OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES 47: 441 (1912).
3. BURTON, E, PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES A 153: 196 (1935).
4. DELSEMME, A.H., ANNALES D'ASTROPHYSIQUE 15: 1 (1952).
5. Delsemme, A. H., 13th International Astrophysical Symposium 37: 77 (1966).