2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218233We derive Wahlquist - Estabrook forms of the covering of Plebanski's second heavenly equation from Maurer - Cartan forms of its symmetry pseudo-group.Differential GeometryMathematical Physics58H05, 58J70, 35A30Maurer - Cartan Forms of the Symmetry Pseudo-Group and the Covering of Plebanski's Second Heavenly Equationtext