On a generalized reflection law for functions satisfying the Helmholtz equation. Aberra, Dawit (1999) Electronic Journal of Differential Equations (EJDE) [electronic only]
Optimal interface error estimates for the mean curvature flow R. H. Nochetto, M. Paolini, C. Verdi (1994) Annali della Scuola Normale Superiore di Pisa - Classe di Scienze