Vaikeat käsitteet.
by???:
Nisula, Jukka.
V: Tiede 2000. - ISSN 0358-1039. - 7(1987) : 5, s. 33
Tiede 2000. - ISSN 0358-1039. - 7(1987) : 5, s.33
Journal article
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V: Tiede 2000. - ISSN 0358-1039. - 7(1987) : 5, s. 33
Tiede 2000. - ISSN 0358-1039. - 7(1987) : 5, s.33
Journal article
