@article{https://resolver.caltech.edu/CaltechAUTHORS:DIEprl61, title = "Photoproduction of single neutral pions from hydrogen at 60° in the 600-1100 Mev region", journal = "Physical Review Letters", year = "1961", url = "https://resolver.caltech.edu/CaltechAUTHORS:DIEprl61", id = "record", issn = "0031-9007", doi = "10.1103/PhysRevLett.7.323", volume = "7" } @article{https://resolver.caltech.edu/CaltechAUTHORS:KILprl60, title = "Photoproduction of Negative Pions from Hydrogen at Forward Angles", journal = "Physical Review Letters", year = "1960", url = "https://resolver.caltech.edu/CaltechAUTHORS:KILprl60", id = "record", issn = "0031-9007", doi = "10.1103/PhysRevLett.5.518", volume = "5" }