Fundamental AstronomyHannu Karttunen, Pekka Kroger, Heikki Oja, Markku Poutanen · First published 1991Open the Tome
Sport for allWorld Congress on Sport for All (1990 Tampere, Finland), Pekka Oja, Risto Telama · First published 1991Open the Tome
Fundamental AstronomyPekka Kroger, Heikki Oja, Markku Poutanen, Karl Johan Donner Hannu Karttunen · First published 1987Open the Tome
A Two kilometre walking test for assessing the cardiorespiratory fitness of healthy adultsPekka OjaOpen the Tome
