Jukka Törnroos

The Finnish success in Pisa - and some reasons behind it : Pisa 2000

Pasi Reinikainen, Inga Arffman, Sari Sulkunen, 2002 .

Mathematics Textbooks, Opportunity to Learn and Student Achievement.

J. Törnroos, Jukka Törnroos, 2005 .