The outputs mentioned in the text are:
1) Silva, E., Stefanou, S. and Lasink, A. O. (2021). Dynamic Efficiency and Productivity Measurement. Oxford University Press. ISBN: 9780190919474
(available
here)
2) Silva, E., Magalhães, M. (2023) Environmental efficiency, irreversibility and the shadow price of emissions. European Journal of Operational Research. 306(2) 955-967 https://doi.org/10.1016/j.ejor.2022.08.011