.LLaaddddeerr oobbsseerrvveedd iinnWWaalllloonniiaa--BBrruusssseelslsFFeeddeeraratitoionn(F(WFWB)B()b(absaesdedonoPnoPuoleuuleruert aelt.,a2l0.,0280(0p8p. (p1p1.51–1154–01) 4a0n)danind2i0n1280).18). More specifically, we will develop our hypotheses on the evolution of this ...