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Beech, M. (Ağustos 1986). "The ellipsoidal variables. III - Circularization and synchronization". Astrophysics and Space Science. 125 (1). ss.69-75. Bibcode:1986Ap&SS.125...69B. doi:10.1007/BF00643972.
Moesgaard, Kristian P. (1973). "Copernican influence on Tycho Brahe". Jerzy Dobrzycki (Ed.). The reception of Copernicus' heliocentric theory: proceedings of a symposium organized by the Nicolas Copernicus Committee of the International Union of the History and Philosophy of Science. Toruń, Poland: Studia Copernicana, Springer. ISBN90-277-0311-6.KB1 bakım: Editörler parametresini kullanan (link)
Beech, M. (Ağustos 1986). "The ellipsoidal variables. III - Circularization and synchronization". Astrophysics and Space Science. 125 (1). ss.69-75. Bibcode:1986Ap&SS.125...69B. doi:10.1007/BF00643972.