Source: https://www.researchgate.net/publication/363507085_Boundaries_and_boundary_crossing_in_a_multidisciplinary_online_higher_education_course_on_forest_bioeconomy/fulltext/635b1fd86e0d367d91d1766d/Boundaries-and-boundary-crossing-in-a-multidisciplinary-online-higher-education-course-on-forest-bioeconomy.pdf