[1] Chatterjee B C, Sarma N, Oki E.Routing and Spectrum Allocation in Elastic Optical Networks: A Tutorial[J]. Communications Surveys & Tutorials IEEE, 2015, 17(3):1776-1800.

[2] Zhang L , Ansari N , Khreishah A. Anycast Planning in Space Division Multiplexing Elastic Optical Networks With Multi-Core Fibers[J].IEEE Communications Letters, 2016, 20(10): 1983-1986.

[3] Favero R V, Bonani L H, Abbade M L F. Spectral reallocation in lightpaths encompassing the most fragmented link of elastic optical networks[C]// ICTON 2016. Trento, Italy: IEEE, 2016: 1-4.

[4] Ioannis Stiakogiannakis, Eleni Palkopoulou, Dimitrios Klonidis, et al. Dynamic Cooperative Spectrum Sharing and Defragmentation for Elastic Optical Networks[J]. Journal of Optical Communications & Networking, 2014, 6(3):259-269.

[5] Chen Xin, Li Juhao, Zhu Paikun. Fragmentation-aware routing and spectrum allocation scheme based on distribution of traffic bandwidth in elastic optical networks[J]. Journal of Optical Communications & Networking, 2015, 7(11):1064-1074.

[6] Joana Sócrates-Dantas, Regina Melo Silveira, Davide Careglio. A Study in Current Dynamic Fragmentation-Aware RSA Algorithms[C]//ICTON 2014. Graz, Austria: IEEE, 2014: 3-4.

[7] Wang X, Zhang Q, Kim I, et al. Utilization Entropy for Assessing Resource Fragmentation in Optical Networks[C]//OFC 2012.Los Angeles , US: IEEE, 2012: OThlA.2.

[8] Yu X, Zhang J, Zhao Y,et al. Spectrum Compactness based Defragmentation in Flexible Bandwidth Optical Networks[C]//OFC 2012. Los Angeles , US: IEEE, 2012: JTh2A.35.