Journal of Mathematical Sciences: Advances and Applications[1] E. A. Silver and J. Mamona, Problem posing by middle school
mathematics teachers, In A. C. Maher, G. A. Goldin & R. B. Davis
(Eds.), Proceedings of the Eleventh Annual Meeting of the North
American Chapter of the International Group for the Psychology of
Mathematics Education, New Brunswick, NJ: Rutgers University (1989),
263-269.
[2] L. Hoehn, Problem posing in geometry, The Mathematics Teachers
91(1) (1991), 10-14.
[3] S. Brown and M. Walter, The Art of Problem Posing (2nd Edition),
Philadelphia: Franklin Institute Press, 1990.
[4] S. Brown and M. Walter, Problem Posing: Reflection and
Applications, Hillsdale: NJ: Erlbaum, 1993.
[5] National Council of Teachers of Mathematics, Principle and
Standards for School Mathematics, Reston, VA: NCTM, 2000.
[6] The Great Soviet Encyclopedia, 3rd Edition (1970-1979), © 2010
The Gale Group, Inc..
[7] I. S. Gradshtein, I. N. Sneddon, M. Stark and S. Ulam, Direct and
Converse Theorems: The Elements of Symbolic Logic (Pure & Direct and
Converse Theorems: The Elements of Symbolic Logic), (First Chapter),
Burlington: Elsevier Science, 2014.
[8] A. I. Fetisov and Ya. S. Dubnov, Proof in Geometry: With Mistakes
in Geometric Proofs (Second Book), Dover Publications, 2006.
[9] R. Lachmy and B. Koichu, Journal of Mathematical Behavior 36
(2014), 150-165.
[10] M. Stupel and D. Ben-Chaim, One problem, multiple solutions: How
multiple proofs can connect several areas of mathematics, Far East
Journal of Mathematical Education 11(2) (2013), 129-161.
[11] R. Liekin, Multiple proof tasks: Teacher practice and teacher
education, ICME Study 19(2) (2009), 31-36.
[12] S. Abu-Saymeh, M. Hajja and H. A. ShahAli, Another Variation on
the Steiner-Lehmus Theorem, Forum Geom. 8 (2008), 131-140.
[13] M. Hajja, A short trigonometric proof of the Steiner-Lehmus
theorem, Forum Geom. 8 (2008), 39-42.
[14] Online Wikipedia - The Euler’s proof.
https://en.wikipedia.org/wiki/Euler%27s_theorem_in_
geometry
[15] A. Engel, Problem-Solving Strategies (Problem Books in
Mathematics), Springer Ed., N.Y., (1991), 291-293.
