Bevelacqua, J. (1983) “Isospin mixing and the $^4$He($\gamma$,$p$)-to-$^4$He($\gamma$,$n$) cross section ratio in the $^4$He giant dipole resonance region”, Revista Mexicana de Física, 30(1), pp. 51–62. Available at: https://rmf.smf.mx/ojs/index.php/rmf/article/view/1263 (Accessed: 6 July 2024).