@第{zbMATH05664260条，作者={利奥波德，科内利}，标题={虚拟和真实几何学习环境}，FJournal={几何与图形杂志}，期刊={J.Geom.Graph.}，ISSN={1433-8157}，体积={13}，数字＝｛1｝，Pages＝{121-130}，年份={2009}，语言={英语}，关键词={00A35,97G10,51N05,00A66}，URL={www.heldermann.de/JGG/JGG13/JGG131/jgg13011.htm}，zbMATH={5664260}，Zbl={1179.00009}}