Khajehzadeh, M., Sobhani, A., Alizadeh, S. M. S., Eslami, M. “A Novel Hybrid Particle Swarm Optimization and Sine Cosine Algorithm for Seismic Optimization of Retaining Structures”, Periodica Polytechnica Civil Engineering, 66(1), pp. 96–111, 2022. https://doi.org/10.3311/PPci.19027