We characterize all possible sets for all continuous self-maps on a connected topological graph with zero Euler characteristic having all branching points fixed. © 1999 Academic Press.
Llibre, J., Paraños, J., & Rodriguez, J. A. (1999). Sets of Periods for Maps on Connected Graphs with Zero Euler Characteristic Having All Branching Points Fixed. Journal of Mathematical Analysis and Applications, 239(1), 85-100. https://doi.org/10.1006/jmaa.1999.6549