Ravanis K. Mental representations and obstacles in 10-11 year old children’s thought concerning the melting and coagulation of solid substances in everyday life. Ppej [διαδίκτυο]. 15 Οκτώβριος 2013 [παρατίθεται 6 Μάιος 2024];1:130-7. διαθέσιμο στο: https://ejournals.epublishing.ekt.gr/index.php/education/article/view/1814