1. Birnbaum, A. Efficient design and use of tests of a mental ability for various decision making problems. Series Report No. 58-16, Project No. 7755-23, USAF School of Aviation Medicine, Randolph Air Force Base, Texas, January 1957.
2. Birnbaum, A. On the estimation of mental ability. Series Report No. 15, Project No. 7755-23, USAF School of Aviation Medicine, Randolph Air Force Base, Texas, 1958. (a)
3. Birnbaum, A. Further considerations of efficiency in tests of a mental ability. Technical Report No. 17, Project No. 7755-23, USAF School of Aviation Medicine, Randolph Air Force Base, Texas, 1958. (b)
4. Indow, T., & Samejima, F. LIS measurement scale for non-verbal reasoning ability. Tokyo: Nippon Bunka Kagakusha, 1962. (In Japanese)
5. Indow, T., & Samejima, F. On the results obtained by the absolute scaling model and the Lord model in the field of intelligence. Third Report of the Psychological Laboratory on the Hiyoshi Campus, Keio University, Japan, 1966.