Tönnsen, Kai-Christian. “The Relevance of Trial-and-Error: Can Trial-and-Error Be a Sufficient Learning Method in Technical Problem-Solving-Contexts?”. Techne Series - Research in Sloyd Education and Craft Science A, vol. 28, no. 2, Apr. 2021, pp. 303-12, https://journals.oslomet.no/techneA/article/view/4391.