Parak N, Lippusch M, Naylor C, Steyskall A, Joubert IA, Himly M, Geppert M. Gold and Silver - but safe?. OSJ [Internet]. 19 marzo 2020 [citato 19 ottobre 2024];3(2). Disponibile su: https://ejournals.epublishing.ekt.gr/index.php/openschoolsjournal/article/view/22597