Interaction between turkey monocytes and avian Chlamydia psittaci in the presence of Mycoplasma sp.: the importance of nitric oxide1192, Ducatelle, R., Charlier G., and Haesebrouck F. , Dev.Comp Immunol., 0/6/2000, Volume 24, Issue 4, Number 432, p.417 - 432, (2000)