1
2
Published: 1975
Superior document: Acta Universitatis Ouluensis : A, Scientiae rerum naturalium 37
3
Published: 1973
Superior document: Acta Universitatis Ouluensis : A, Scientiae rerum naturalium 21
4
Published: 1992
Superior document: Acta Universitatis Ouluensis : A, Scientiae rerum naturalium 238