فيثاغورث يحمي الحيتان

1. Pythagoras Saves the Whales [Internet]. Maths Careers. [cited 3 October 2021]. Available from:

 هنا

2. Budd C. Saving whales using Pythagoras [Internet]. plus.maths.org. [cited 3 October 2021]. Available from:

 هنا

3. BUDD C. Can Maths Save The Whales and Cure Cancer? [Internet]. Gresham.ac.uk. 2020 [cited 6 December 2021]. Available from: هنا