Alimoradzadeh, M. et al. 2020. Nonlinear Vibration Analysis of Axially Functionally Graded Microbeams Based on Nonlinear Elastic Foundation Using Modified Couple Stress Theory. Periodica Polytechnica Mechanical Engineering. 64, 2 (Jan. 2020), 97–108. https://doi.org/10.3311/PPme.11684.