@conference {449, title = {Unpacking Children{\textquoteright}s Angle "Grundvorstellungen{\textquotedblright}: The Case of Distance {\textquotedblleft}Grundvorstellung{\textquotedblright} of 1{\textdegree} Angle}, booktitle = {PME 38}, year = {2014}, month = {2014}, address = {Vancouver, Canada}, author = {Ana Kuzle and Christian Dohrmann}, editor = {Peter Liljedahl and Natalie Sinclare} }