This is pretty much common knowledge, not common myth, among many, many weight men over the years. I have no researched White Papers, or any thing like that, to booster up the results of Rib Box expansion during the plastic phase on the younger lifter. Sorry.
Person experiment , investigating the results (or none) would be best served if perhaps yourself or a study subject, in lifting, would wish to plan a serious training pullover protocol; duration a 2 month period. And then measure the results of such a undertaking. For the sake of research and the common interest of the average BBér/lifter.
Just to say, 20 rep breathing squats, with pullovers, have proven to give minor miracles in rapid muscular weight gains and impressive increases in total chest/rib box size. As Mr. Turbo had suggested. Made by best gains, by far, on this type of serious training program. Good Luck.