عیوب تولد در مرغابیها میشود. Ladewig, Bradley; Asquith, Benjamin (2012), Ladewig, Bradley; Asquith, Benjamin (eds.), "Evaporation Ponds", Desalination
Planning and Inference. 136: 193–198. doi:10.1016/j.jspi.2004.06.004. Asquith, W.H. (2011) Distributional analysis with L-moment statistics using the R