利用权转移方法证明每个最小度至少为5并且最小边度至少为11的IC-平面图含有一个最大度至多为11的弦4-圈。
It is proved by discharging method that every IC-planar graph with minimum vertex degree at least 5 and minimumedge degree at least 11 contains a chordal 4-cycle with maximum degree at most 11.