Chiba, S. and Oneda, S. and Pati, J. C. (1961) Σ-Λ Relative Parity and the Σ0→Λ0+γ+γ Decay. Physical Review, 124 (2). pp. 611-614. ISSN 0031-899X. https://resolver.caltech.edu/CaltechAUTHORS:CHIpr61