The artists working in this style for Spirou, including Franquin, Morris "wikipedia:Morris (comics)"), Jean Roba and Peyo, are often grouped as the Marcinelle school.
This is the almost Barksian line of Franquin and Uderzo. Pilote is almost exclusively comic-dynamic, and so is Spirou and l'Écho des savanes. These comics have very agitated drawings, often using lines of varying thickness to accent the drawings. The artists working in this style for Spirou, including Franquin, Morris "wikipedia:Morris (comics)"), Jean Roba and Peyo, are often grouped as the Marcinelle school.