Mahmudah, A. M. H., Syafi’I, Handayani, D., Legowo, S. J., & Hartono, W. (2021). Activity and Time Value of Public Passenger Transportation Users During the Covid-19 Pandemic in 2020 (Bus of Batik Solo Trans Corridor 4 in Surakarta). Indonesian Journal of Engineering Research, 2(2), 32-37. https://doi.org/10.11594/10.11594/ijer.02.02.01