Autor:	Mateeva, Zoya, Batchvarova, Ekaterina, Spasova, Zornitsa, Ivanov, Ivan, Kazakov, Boris, Matev, Simeon, Simidchiev, Alexander, Kitev, Atanas
Zdroj:	Обучение по природни науки и върхови технологии / Natural Science and Advanced Technology Education. 31(6):552-575
Databáze:	Central and Eastern European Online Library (CEEOL)
Externí odkaz:	https://www.ceeol.com/search/article-detail?id=1086709 Zobrazit plný text záznamu