By A. Jarmakani
By L. Rivero
By S. Garton, K. Richards
By M. Gardner, U. Kelly
By F. Trix, J. Walbridge
By E. O'Sullivan
By E. O'Sullivan, A. Morrell, M. O'Connor
By L. Weiner, M. Compton
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By Michalinos Zembylas
By Nicholas Copernicus, Rosen, Jerzy Dobrzycki
By D. Kapoor, E. Shizha
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By Baker, David
By Patrick Moore, John Mason
By Brian May, Patrick Moore, Chris Lintott
By James Evans (Professor of Physics, Professor of Physics, University of Puget Sound, Tacoma, Washington, USA)
By Gerald North