DEVELOPING INTERACTIVE E-CONTENTS FOR A MATHEMATIC ERASMUS+ PROJECT – CHALLENGES AND EXPERIENCES
F. Soares, A.P. Lopes, A. Cellmer, A. Uukkivi, C. Rebollar, C. Varela, C. Feniser, E. Bravo, E. Safiulina, G. Kelly, J. Bilbao, J. Cymerman, K. Brown, M. Latõnina, O. Garcia, O. Labanova, V. Bocanet