You don’t need a study you can just grab some results from Zwift power to show that. Heavier riders usually put out a lot more power than light riders
Just for fun, look at the TTT on Greater london flat. The heaviest rider had to average 303w while the lighter rider averaged 185w.
go to zwift power and grab the results of a big race, pic one of the Zwift races that does not have any start groups and no filtering, then plot rider weight vs finishing position, you will see a linear relationship, that heavier riders tend to go slower.