Bern, Marshall; Hayes, Barry (1996). 〈The complexity of flat origami〉. 《Proceedings of the Seventh Annual ACM-SIAM Symposium on Discrete Algorithms (Atlanta, GA, 1996)》. ACM, New York. 175–183쪽. MR1381938.
Bern, Marshall; Hayes, Barry (1996). 〈The complexity of flat origami〉. 《Proceedings of the Seventh Annual ACM-SIAM Symposium on Discrete Algorithms (Atlanta, GA, 1996)》. ACM, New York. 175–183쪽. MR1381938.