Countercurrent Double-pipe Heat Exchangers are a Special Type of Positive Systems. - Arturo Zavala-Río; Ricardo Femat; Ricardo Romero-Méndez (POSTA, 2003)

The laminar horseshoe vortex upstream of a short-cylinder confined in a channel formed by a pair of parallel plates. - Marcos Matthäus-Rodríguez y Domínguez; Ricardo Romero-Méndez; Mónica Ramos-Paláu; Francisco Gerardo Pérez-Gutiérrez (J. Vis., 2006)