Tsihouridis, C., D. Vavougios, and G. Ioannidis. “The Effect of Switching the Order of Experimental Teaching in the Study of Simple Gravity Pendulum – A Study With Junior High-School Learners”. International Journal of Emerging Technologies in Learning (iJET), vol. 12, no. 03, Mar. 2017, pp. pp. 128-141, doi:10.3991/ijet.v12i03.6492.