@misc {MATHEDUC.02454173,
    author       = {Koelbl, I.},
    title        = {On the coordination of mathematics instruction with other subjects in school. Zur zeitlichen Koordinierung des Mathematikunterrichts mit anderen Unterrichtsfaechern .},
    howpublished = {Math. Schule. (1976) v. 14(6) p. 308-312.},
    year         = {1976},
    identifier   = {1977a.00374},
}