Luo L, Wu W, He K (2024).surtvep: Cox Non-Proportional Hazards Model with Time-Varying Coefficients.https://github.com/UM-KevinHe/surtvep,https://um-kevinhe.github.io/surtvep/.

@Manual{,  title = {surtvep: Cox Non-Proportional Hazards Model with Time-Varying Coefficients},  author = {Lingfeng Luo and Wenbo Wu and Kevin He},  year = {2024},  note = {https://github.com/UM-KevinHe/surtvep,https://um-kevinhe.github.io/surtvep/},}