Final answer:
The findings of the Schweinle study mentioned on pg. 135 cannot be determined from the given references. Access to the specified page and study is required to provide an accurate answer.
Step-by-step explanation:
Given the information provided, it is not possible to accurately determine what the findings of the Schweinle study were based on the references to other studies and publications listed. However, research studies typically involve investigating hypotheses, analyzing data, and drawing conclusions based on that analysis. To learn more about the findings of the Schweinle study, you would need to look up the specific study by Schweinle, which should be located on page 135 of the source you are referring to.