by KESKITALO, ERKKI M, SUONPERAE, TIMO K, UKKONEN, KEIJO A
Year of Publication 22.01.2002

by LAMMI SIRPA H, RAVASKA MATTI E, UKKONEN KEIJO A
Year of Publication 12.03.1999

by MATTI ELIAS RAVASKA, KEIJO A UKKONEN, SIRPA HANNELE LAMMI
Year of Publication 13.10.1997

by LAMMI SIRPA H, RAVASKA MATTI E, UKKONEN KEIJO A
Year of Publication 31.01.1996

by SIMPURA; ESA J, UKKONEN; KEIJO A
Year of Publication 21.07.1981

by KESKITALO, ERKKI M, SUONPERAE, TIMO K, UKKONEN, KEIJO A
Year of Publication 14.09.1993

by RAVASKA, MATTI, E, UKKONEN, KEIJO A, LAMMI, SIRPA H
Year of Publication 29.06.1992

by KRAJCA, KENNETH E, UKKONEN, KEIJO A, HANSEN, JAMES E, EVANS, JAMES M
Year of Publication 07.02.1987

by KRAJCA; KENNETH E, EVANS; JAMES M, HANSEN; JAMES E, UKKONEN; KEIJO A
Year of Publication 16.10.1984