1. George E. Andrews. Number Theory. Combinatorial and Computational.Number Theory. Dover Publications, Inc. New York.1994.

2. Dr. Richard J. Mathar. Max-Planck Institute of Astronomy.

3. A.W.Goodman.Analytic Geometry and the Calculus.[third edition].Chapter 3. Introduction to the Analytic Geometry.The Circumference.Macmillan Publishing Co.Inc.1963.866 Third Avenue.New York.USA.

4. John Voight, Perfect Numbers: An Elementary Introduction.Page 5.Herbert Gross: Differential Equations, Lecture 1: The Concept of a General Solution.MIT.

5. On Primitive Pythagorean Triples. 2021. hal-03247261

6. H. Lee Price The Pythagorean Tree: A New Species.arXiv:0809.432

7. Paul J. Nahin.An Imaginary Tale.The Story of √−1.Chapter Four.Using Complex Numbers.Page 90.princeton science library

8. University of Florida.Proof of the Cotes Theorem.https://mae.ufl.edu/ uhk/COTES%20THEOREM.pdf

9. University of San Antonio.The Geometric Interpretation of the Determinant.https://mathresearch.utsa.edu/wiki/index.php?title=The Geometric Interpretation of the Determinant

10. AMERICAN UNIVERSITY WASHINGTON. DC.Artemas Martin Collection of Mathematical and Scientific Works.https://www.american.edu/library/archives/finding aids/amartin fa.cfm