@article{https://resolver.caltech.edu/CaltechAUTHORS:BURpnas70, title = "Is the Breakdown of the Born-Oppenheimer Approximation Responsible for Internal Conversion in Large Molecules?", journal = "Proceedings of the National Academy of Sciences of the United States of America", url = "https://resolver.caltech.edu/CaltechAUTHORS:BURpnas70", id = "record", issn = "0027-8424", volume = "66" }