Campillo-Robles, Jose M.; Alonso, Ibon; Gondra, Ane; Gondra, Nerea. (2022-09). [http://dx.doi.org/10.1119/5.0061884 «Calculation and measurement of center of mass: An all-in-one activity using
Tangram puzzles»] American Journal of Physics 90 (9): 652. doi:10.1119/5.0061884. ISSN0002-9505. (Noiz kontsultatua: 2022-10-30).
Campillo-Robles, Jose M.; Alonso, Ibon; Gondra, Ane; Gondra, Nerea. (2022-09). [http://dx.doi.org/10.1119/5.0061884 «Calculation and measurement of center of mass: An all-in-one activity using
Tangram puzzles»] American Journal of Physics 90 (9): 652. doi:10.1119/5.0061884. ISSN0002-9505. (Noiz kontsultatua: 2022-10-30).