H. Huang, J. Ayoub and P. Sullivan. Rheology Controlled Heterogeneous Particle Placement in Hydraulic Fracturing. WO/2008/004172; EP Patent 2,041,237, 2009; US Patent 7,798,224, 2010.
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H. Huang, J. Ayoub and P. Sullivan. Rheology Controlled Heterogeneous Particle Placement in Hydraulic Fracturing. WO/2008/004172; EP Patent 2,041,237, 2009; US Patent 7,798,224, 2010.