Rodney Huddleston Geoffrey K Pullum. (2017). The Cambridge Grammar of the English Language. p.612.
However, we will not depart further from the traditional account than is justified.
- However, we will not depart further from the justified traditional account.
- However, we will depart further from the traditional account unless justified.
What does it mean? Is it a kind of 'negative transfer', and why does 'not + than' have the meaning of 'unless'?