Prevalence of Mycoplasma gallisepticum and Mycoplasma synoviae in commercial poultry, racing pigeons and wild birds in Belgium., Michiels, Tinne, Welby Sarah, Vanrobaeys Mia, Quinet Christian, Rouffaer Lieze, Lens Luc, Martel An, and Butaye Patrick , Avian Pathol, 2016, Volume 45, Issue 2, p.244-52, (2016)