For the aircraft that I fly (Falcon900) I have been told that minimum maneuvering speed (protect you from stall in a 30 degrees turn) was Vref for your configuration (for this case Vref with no slats and flaps) + 20 Kt. That speed would be very close to Vfinal take off.
I haven't seen this written or explained in any book.
For me I feel that it is to low so I fly 200 knots when they asked me min. clean speed.