Tone Bratteteig Gisle Hannemyr Jens Kaasbøll In Memory of Kristen Nygaard. 2002 14 Scandinavian J. Inf. Systems 2 http://www.e-sjis.org/journal/volumes/volume14/articles/no2/999_obi_sjis_ss.123-126_.pdf db/journals/sjis/sjis14.html#BratteteigHK02