He frequently made use of pseudonyms, including "Julienne de Cherisy," "Robert Desessarts," "Jules-François Dupuis," "Tristan Hannaniel," "Anne de Launay," and "Michel Thorgal.
Он часто использует разные временные псевдонимы: Julienne de Cherisy, Robert Desessarts, Jules-François Dupuis, Tristan Hannaniel, Anne de Launay, Ratgeb, Michel Thorgal.