\input zb-basic
\input zb-matheduc
\iteman{ZMATH 1992c.00752}
\itemau{Christova, M.K.; Neikova, N.V.}
\itemti{Possibilities for development of the students' spatial thinking in studying the general part of stereometry. Zur Entwicklung des raeumlichen Vorstellungsvermoegens im Stereometrieunterricht.}
\itemso{Mathematics and education in mathematics. Mathematik und Mathematikunterricht. Bylgarska Akademiya na Naukite, Sofia. Matematischeski Inst. 1990. p. 548-554 of 595 p. Available from FIZ Karlsruhe. Conference: Nineteenth Spring Conference of the Union of Bulgarian Mathematicians, Sunny Beach (Bulgaria), 6-9 Apr 1990}
\itemab

\itemrv{~}
\itemcc{C33 G43 D83 D43}
\itemut{Spatial Ability; Solid Geometry; Grade 9; Experience Reports; Lesson Plans; Unterrichtsmethode; ; Raumvorstellung; Raumgeometrie; Klasse 9; Erfahrungsbericht; Unterrichtsentwurf; Unterrichtsmethode}
\itemli{}
\end