It's been a looooong time since I looked up this issue so I can't remember the references off the top of my head. I'd appreciate it if someone can please post some evidences on this issue. There's a common misconception that the consent of the first wife is mandatory in order for a Muslim man to marry again. I'd prefer to have direct Q&S references on this matter rather than long fatwas but if a fatwa also contains and explains the evidences as well then I'd accept that as a source too. I'm not one of these people who's happy to just see a fatwa in which a sheikh just says "yes this is permitted" or "no that is not permitted" just because it's from a scholar, rather I prefer to see one in which the Q&S evidence is quoted as the basis of the fatwa and then explained. Hope you understand, jazakallah khayr.