LUPU, I., and M. HAJDEU. “The Methods of Solving Nonstandard Mathematical Problems - an Important Factor in the Formation of pupils’ Mathematical Competence”. * Acta Et Commentationes Sciences of Education *, Vol. 20, no. 2, July 2020, pp. 24-34, doi:10.36120/2587-3636.v20i2.24-34.