Oil-related producer services and productivity : the case of Norw ay / Hildegunn Kyvik Nordas and Ola Kvaloy. - Bergen : Chr. Michelsen Institute, 2000. - 30 p. ; 30 cm. - CMI Working Paper ; WP 2000: 6 . ISBN: 8290584598 Subjects--Topical Terms: Petroleum sector. Dewey Class. No.: 382.45622338