Arve Opsahl under opptak av TV-programmet "Slagerparaden" i NRK, den 2. desember 1960. Kamerafolk i aksjon bak fjernsynskameraet. - Norsk Folkemuseum / DigitaltMuseum
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Developing Sustainable Business Models: A Microfoundational Perspective - Kristin Ringvold, Tina Saebi, Nicolai Foss, 2022
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