Lin, Chien-Liang, and Yu-Che Lai. “An Improved Time-Cost Trade-off Model With Optimal Labor Productivity”. Journal of Civil Engineering and Management 26, no. 2 (February 7, 2020): 113-130. Accessed January 31, 2025. https://jest.vgtu.lt/index.php/JCEM/article/view/11663.