@book{ Solr-735723, title = {Didactical phenomenology of mathematical structures / [E-Book]}, author = {Freudenthal, Hans}, editor = {Freudenthal, Hans}, address = {Boston}, publisher = {Kluwer Academic}, year = {1983}, pages = {607}, note = {englisch}, url = {https://ebookcentral.proquest.com/lib/fz/detail.action?docID=3035412} }