Numerical simulation of inertial energy harvesters using magnets
          Gonçalves, A.; Morgado, M. Luísa; Morgado, L. F.; Silva, N.; Morais, R.  
          
          Innovation, Engineering and Entrepreneurship,  HELIX 2018. Lecture Notes in Electrical Engineering,  (2019),   
          https://link.springer.com/chapter/10.1007%2F978-3-319-91334-6_103  
           
            
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