Ahlstrand, J. T. Berlin and the Swedish Avant-Garde: GAN, Nell Walden, Viking Eggeling, Axel Olson and Bengt Österblom / Jan Thorsten Ahlstrand. A cultural history of the avant-garde in the Nordic countries 1900 - 1925.(2012).

Ahlstrand, Jan Thorsten. "Berlin and the Swedish Avant-Garde: GAN, Nell Walden, Viking Eggeling, Axel Olson and Bengt Österblom / Jan Thorsten Ahlstrand." A Cultural History of the Avant-garde in the Nordic Countries 1900 - 1925.(2012) .

Ahlstrand, Jan Thorsten. "Berlin and the Swedish Avant-Garde: GAN, Nell Walden, Viking Eggeling, Axel Olson and Bengt Österblom / Jan Thorsten Ahlstrand." A Cultural History of the Avant-garde in the Nordic Countries 1900 - 1925.(2012), .