Signed circuit $6$-covers of signed $K_4$-minor-free graphs

You Lu, Rong Luo, Zhengke Miao +1

Bermond, Jackson and Jaeger [{\em J. Combin. Theory Ser. B} 35 (1983): 297-308] proved that every bridgeless ordinary graph $G$ has a circuit $4$-cover and Fan [{\em J. Combin. The…