Vuojärvi H, Eriksson M, Vartiainen H. Cross-Boundary Collaboration and Problem-Solving to Promote 21st Century Skills— Students’ Experiences. IJLTER [Internet]. 2019 Dec. 30 [cited 2026 May 2];18(13):30-6. Available from: http://www.ijlter.net/index.php/ijlter/article/view/327