@techreport{LindnerLiebchenMasing2021, author = {Niels Lindner and Christian Liebchen and Berenike Masing}, title = {Forward Cycle Bases and Periodic Timetabling}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {21-18}, language = {eng}, year = {2021} }