Under CopyrightHamacher, H.W.H.W.HamacherSchöbel, A.A.Schöbel2022-03-0716.09.20061998https://publica.fraunhofer.de/handle/publica/28988210.24406/publica-fhg-289882Contents S.2 1 Introduction S.3 2 Basic Results S.4-6 3 Cycle-Center Problems with Rectangular Cycles S.7-12 - 3.1 Rectangular cycles with fi xed shape S.7-10 - 3.2 Rectangular cycles with fi xed circumference S.10-12 - 3.3 Rectangular cycles without constraints S.12 4 Conclusion and Extension S.13 5 Acknowledgment S.14-15en519003006report