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