A. Erturk, J. Hoffmann, and D. J. Inman, “A piezomagnetoelastic structure for broadband vibration energy harvesting,” Appl. Phys. Lett., vol. 94, no. 25, 2009.
 A. Doroushi, M. R. Eslami, and A. Komeili, “Vibration analysis and transient response of an FGPM beam under thermo-electro-mechanical loads using higher-order shear deformation theory,” J. Intell. Mater. Syst. Struct., vol. 22, no. 3, pp. 231–243, 2011.
 M. Komijani, J. N. Reddy, and M. R. Eslami, “Nonlinear analysis of microstructure-dependent functionally graded piezoelectric material actuators,” J. Mech. Phys. Solids, vol. 63, no. 1, pp. 214–227, 2014.
 D. J. Huang, H. J. Ding, and W. Q. Chen, “Piezoelasticity solutions for functionally graded piezoelectric beams,” Smart Mater. Struct., vol. 16, no. 3, pp. 687–695, 2007.
 J. J. Choi, B. D. Hahn, J. Ryu, W. H. Yoon, B. K. Lee, and D. S. Park, “Preparation and characterization of piezoelectric ceramic-polymer composite thick films by aerosol deposition for sensor application,” Sensors Actuators, A Phys., vol. 153, no. 1, pp. 89–95, 2009.
 M. Dietze and M. Es-Souni, “Structural and functional properties of screen-printed PZT-PVDF-TrFE composites,” Sensors Actuators, A Phys., vol. 143, no. 2, pp. 329–334, 2008.
 A. Kumar, A. Sharma, R. Vaish, R. Kumar, and S. C. Jain, “A numerical study on anomalous behavior of piezoelectric response in functionally graded materials,” J. Mater. Sci., vol. 53, no. 4, 2018.
 M. Derayatifar and M. Tahani, “Nonlinear Free Vibration of Functionally Graded Piezomagnetoelastic Energy Harvester,” in The Twenty-Fifth Annual International Conference on Composites/Nano Engineering (ICCE-25), 2017.
 H. T. Thai, T. P. Vo, T. K. Nguyen, and J. Lee, “Size-dependent behavior of functionally graded sandwich microbeams based on the modified couple stress theory,” Compos. Struct., vol. 123, pp. 337–349, 2015.
 A. Abdelkefi and N. Barsallo, “Comparative modeling of low-frequency piezomagnetoelastic energy harvesters,” J. Intell. Mater. Syst. Struct., vol. 25, no. 14, pp. 1771–1785, 2014.
 A. H. Nayfeh, Introduction to Perturbation Techniques (Ali Hasan Nayfeh), vol. 24, no. 3. 1982.