___

• [1] Austin, H. W. and Austin, J. W., On a special set of symmetric Pythagorean triple preserving matrices. Adv. Appl. Math. Sci. 12 (2012), no. 2, 97-104.
• [2] Barning, F. J. M., On Pythagorean and quasi-Pythagorean triangles and a generation process with the help of unimodular matrices (Dutch). Math. Centrum, Amsterdam, Afd. Zuivere Wisk. ZW, 1963-011, 37 p.
• [3] Bruening, J. T., Lohmeier, T. R. and Sebaugh, C. L., Symmetric Pythagorean triple preserving matrices. Missouri J. Math. Sci. 13 (2001), no. 1, 4-16.
• [4] Crasmareanu, M., A new method to obtain Pythagorean triple preserving matrices. Missouri J. Math. Sci. 14 (2002), no. 3, 149-158.
• [5] Crasmareanu, M., A complex approach to the gradient-type deformations of conics. Bull. Transilv. Univ. Bra¸sov, Ser. III, Math. Inform. Phys. 10(59) (2017), no. 2, 59-62.
• [6] Katayama, Shin-ichi, Modified Farey trees and Pythagorean triples. J. Math., Univ. Tokushima 47 (2013), 1-13.
• [7] Murasaki, T., On the Heronian triple (n + 1; n; n - 1) (Japanese). Sci. Rep. Fac. Educ. Gunma Univ. 52 (2004), 9-15.
• [8] Murru, N., Abrate, M., Barbero, S. and Cerruti, U., Groups and monoids of Pythagorean triples connected to conics. Open Math. 15 (2017), 1323-1331.
• [9] Palmer, L., Ahuja, M. and Tikoo, M., Finding Pythagorean triple preserving matrices. Missouri J. Math. Sci. 10 (1998), no. 2, 99-105.
• [10] Palmer, L., Ahuja, M. and Tikoo, M., Constructing Pythagorean triple preserving matrices. Missouri J. Math. Sci. 10 (1998), no. 3, 159-168.
• [11] Romik, D., The dynamics of Pythagorean triples. Trans. Am. Math. Soc. 360 (2008), no. 11, 6045-6064.
• [12] Tikoo, M., A note on Pythagorean triple preserving matrices. Internat. J. Math. Ed. Sci. Tech. 33 (2002), no. 6, 893-894.
• [13] Tikoo, M. andWang, H., Generalized Pythagorean triples and Pythagorean triple preserving matrices. Missouri J. Math. Sci. 21 (2009), no. 1, 3-12.