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 Physics90(9): 652.doi:10.1119/5.0061884.ISSN0002-9505.(kontsulta data: 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 Physics90(9): 652.doi:10.1119/5.0061884.ISSN0002-9505.(kontsulta data: 2022-10-30).