. . . "F" . "Richard F." . "Luduena" . . "Ludueña"@en . . "F."@en . . . "Ludueña"@fr-FR . "Richard"@en . "Richard F Ludueña"@en . . . . . "Richard F. Luduena"@hr-HR . "Richard F. Luduena" . "Richard F. Ludueña"@en . .