PAULS, M.P. et al. 2018. Interdisciplinarity under consideration of the Theoretical System of Expanded Affectivity: An essay about overcoming difficulties in learning of Mathematics through Language and Semiotics. International Journal for Innovation Education and Research. 6, 7 (Jul. 2018), 33–52. DOI:https://doi.org/10.31686/ijier.vol6.iss7.1091.