Toland, John F. “Errata to ‘Stokes Waves’ (Topol. Methods Nonlinear Anal. 7 (1996), 1–48)”. Topological Methods in Nonlinear Analysis, vol. 8, no. 2, Dec. 1996, pp. 413-4, https://apcz.umk.pl/TMNA/article/view/34313.