Template-free hydrothermal synthesis of hexa ferrite nanoparticles and its adsorption capability for different organic dyes: Comparative adsorption studies, isotherms and kinetic s... oleh Usha Jinendra, D. Bilehal, B.M. Nagabhushana, Kakarla Raghava Reddy, Ch. Venkata Reddy, Anjanapura V. Raghu