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What is shadow?.
European Journal of Physics Education, [S.l.], v. 9, n. 1, p. 15-22, aug. 2018.
ISSN 1309-7202.
Available at: <https://eu-journal.org/index.php/EJPE/article/view/167>. Date accessed: 18 apr. 2024.
doi: https://doi.org/10.20308/ejpe.v9i1.167.