Pedro Alves (2021). “Is and Ought: Where Does the Problem Lie?”, in P. Di Lucia and E. Fittipaldi (eds.), Revisiting Searle on Deriving “Ought” from “Is”, pp. 33-57.
https://doi.org/10.1007/978-3-030-54116-3_3
https://doi.org/10.1007/978-3-030-54116-3_3