The Riccati differential equation and a diffusion-type equation. Suazo, Erwin, Suslov, Sergei K., Vega-Guzmán, José M. (2011) The New York Journal of Mathematics [electronic only]
The well-posedness of the Dirichlet problem in the cylindric domain for the multidimensional wave equation. Aldashev, Serik A. (2010) Mathematical Problems in Engineering