Meyer, Daniel; Meyer, Jeanine; Meyer, Aviva (March 2000). "Teaching mathematical thinking through origami". Academic.Writing: Interdisciplinary Perspectives on Communication Across the Curriculum. 1 (9): 1. doi:10.37514/awr-j.2000.1.9.41.; see in particular section "Dividing into thirds"
doi.org
Meyer, Daniel; Meyer, Jeanine; Meyer, Aviva (March 2000). "Teaching mathematical thinking through origami". Academic.Writing: Interdisciplinary Perspectives on Communication Across the Curriculum. 1 (9): 1. doi:10.37514/awr-j.2000.1.9.41.; see in particular section "Dividing into thirds"