The following publications are possibly variants of this publication:
- Edges incident with a vertex of degree greater than four and a lower bound on the number of contractible edges in a 4-connected graphShunsuke Nakamura, Yoshimi Egawa, Keiko Kotani. endm, 68:23-28, 2018. [doi]
- Contractible edges and liftable vertices in a 4-connected graphKiyoshi Ando. DM, 345(2):112677, 2022. [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]
- Edges not contained in triangles and the number of contractible edges in a 4-connected graphKiyoshi Ando, Yoshimi Egawa. DM, 308(23):5463-5472, 2008. [doi]