N. Augustine, H. Kotturu, S. Meenatchi Sundaram, and G. S. Vijay, “Analytical modelling of spiral cantilever structure for vibration energy harvesting applications”, IJET, vol. 7, no. 2.21, pp. 39–42, Apr. 2018, doi: 10.14419/ijet.v7i2.21.11832.