Hernández Hernández, E., Caballero Blanco, P., Gómez Rodríguez, A., & Morenas Martín, J. (2014). Design and validation of an observational instrument to assess the technical execution in top-rope climbing. Journal of Human Sport and Exercise, 9(1), 111–123. https://doi.org/10.4100/jhse.2014.91.12