1. D.J. Adams, B.A. Cooke, K. Evans, K.A. Pounds, Rocket observations of virgo XR-1. Nature 222, 757-759 (1969)
2. I. Adler, J. Gerard, J. Trombka et al., in Apollo 15 - Preliminary Science Report, NASA SP-289, Chapter 17 (1972a)
3. I. Adler, J. Trombka, J. Gerard et al., in Apollo 16 - Preliminary Science Report, NASA SP-315, Chapter 19 (1972b)
4. I. Adler, R. Schmadebeck, J. Trombka et al., Space Sci. Instrum. 1, 305 (1975)
5. P.C. Agrawal, S. Biswas, G.S. Gokhale et al., Sudden changes in the intensity of high energy x-rays from sco X-1. Nature 224, 51-53 (1969)