Álvarez Sánchez JJ, Álvarez-Bravo JV, González-Cabrera FJ, López Luengo MA, Salamanca-Escorial B. QUALITATIVE APPROACH TO PHYSICAL CONCEPTS TEACHING. Red [Internet]. 2005 Jul. 26 [cited 2024 Jul. 17];. Available from: https://revistas.um.es/red/article/view/24451