The following publications are possibly variants of this publication:
- Structure of edges in a 4-connected graph not contained in triangles and the number of contractible edgesYoshimi Egawa, Keiko Kotani, Shunsuke Nakamura. akcej, 15(2):202-210, 2018. [doi]
- Lower Bound on the Number of Contractible Edges in a 4-Connected Graph with Edges Not Contained in TrianglesYoshimi Egawa, Keiko Kotani, Shunsuke Nakamura. gc, 34(5):965-987, 2018. [doi]
- Edges not contained in triangles and the distribution of contractible edges in a 4-connected graphKiyoshi Ando, Yoshimi Egawa. DM, 308(16):3449-3460, 2008. [doi]
- On the number of 4-contractible edges in 4-connected graphsKiyoshi Ando, Yoshimi Egawa, K. Kawarabayashi, Matthias Kriesell. JCT, 99(1):97-109, 2009. [doi]