Yang Y, Liu Y. Flexibility of Embeddings of Bouquets of Circles on the Projective Plane and Klein Bottle. Electron. J. Combin. [Internet]. 2007Nov.23 [cited 2026Mar.28];14(1):R80. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v14i1r80