Effect of pH on nanocrystalline Co-ferrite prepared using urea and thiourea fuels by combination of sol-gel auto combustion and ultrasonic irradiation methods Sh. Moradi, S. S. Madani, G. Mahmoudzadeh, M. Zhalechin, S. A. Khorrami, 10.7508/ijnd.2012.02.007 Requires Subscription HTML views: 17