Kumpel, P. G. (1975), "Do similar figures always have the same shape?", The Mathematics Teacher, 68 (8): 626–628, doi:10.5951/MT.68.8.0626, ISSN0025-5769.
Yates, Robert C. (1941). "The Trisection Problem". National Mathematics Magazine. 15 (4): 191–202. doi:10.2307/3028133. JSTOR3028133.
Middleton, W. E. Knowles (December 1961). "Archimedes, Kircher, Buffon, and the Burning-Mirrors". Isis. 52 (4). Published by: The University of Chicago Press on behalf of The History of Science Society: 533–543. doi:10.1086/349498. JSTOR228646. S2CID145385010.
Yates, Robert C. (1941). "The Trisection Problem". National Mathematics Magazine. 15 (4): 191–202. doi:10.2307/3028133. JSTOR3028133.
Middleton, W. E. Knowles (December 1961). "Archimedes, Kircher, Buffon, and the Burning-Mirrors". Isis. 52 (4). Published by: The University of Chicago Press on behalf of The History of Science Society: 533–543. doi:10.1086/349498. JSTOR228646. S2CID145385010.
Middleton, W. E. Knowles (December 1961). "Archimedes, Kircher, Buffon, and the Burning-Mirrors". Isis. 52 (4). Published by: The University of Chicago Press on behalf of The History of Science Society: 533–543. doi:10.1086/349498. JSTOR228646. S2CID145385010.
Kumpel, P. G. (1975), "Do similar figures always have the same shape?", The Mathematics Teacher, 68 (8): 626–628, doi:10.5951/MT.68.8.0626, ISSN0025-5769.