The Vertices of Lower Degree in Contraction Critical $\kappa$ Connected

The Vertices of Lower Degree in Contraction-Critical $\kappa$ Connected，袁旭东，李婷婷，Let $G$ be a contraction-critical $\kappa$ connected graph. It is known (see {\it Graphs and Combinatorics}, 7 (1991) 15-21) that the minimum degree of $G$ is at most $\lfloor \