@misc {MATHEDUC.02407449,
    author       = {Jirotkova, D.},
    title        = {The development of spatial imagination of pupils. Rozvoi prostorove predstavivosti zaku. Zur Entwicklung der raeumlichen Anschauung bei Schuelern.},
    howpublished = {Komensky. (Jan 1990) v. 114(5) p. 278-281. [ISSN 0323-0449]},
    year         = {1990},
    msc2010      = {C32xx},
    identifier   = {1993b.01915},
}