Marek Gugała ; Krystyna Zarzecka ; Anna Sikorska...
http://www.journalssystem.com/jeeng/THE-IMPACT-OF-METHODS-OF-CARE-ON-THE-CONTENT-AND-COLLECTION-OF-ZINC-AND-COPPER-WITH-THE-YIELD-OF-POTATO-TUBERS,64500,0,2.html.  , 2016