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2. Alexander, P. P., “Reduction of Ores by Metallic Calcium,” U.S. Patent 2,043,363 (June 9, 1936).
3. Alexander, P. P., “Production of Calcium Hydride,” U.S. Patent 2,082,134 (June 1, 1937).
4. Alexander, P. P., “The Hydride Process-I,” Metals and Alloys 8, 263 (1937).
5. Alexander, P. P., “The Hydride Process-II,” Metals and Alloys 9, 45 (1938).