- Publication right to problems are reserved by the original publishers. When citing problems, only orginal sources should be listed
- The following publishers have granted permission to reprint problems here;
- The international mathematical olympiad
- problems corner.org( Founded by MathPro and the Department of mathematical and Staistics of the university of Missouri- Rolla
- the Canadian mathematical society (Crux Mathematicorum with Mayhem)
- KAIST(Korea Advanced Institute of Science and Technology) ,Marthematical problem solving Group
