Shi, En Hui et al., Sensitive open maps on Peano continua having a free arc, Acta mathematica Sinica. English series (Print) , 32(6), 2016, pp. 736-744
Let X be a Peano continuum having a free arc. If X admits a sensitive open map, then X either is homeomorphic to the closed interval [0, 1], or is homeomorphic to the unit circle S1.