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US4477492A   [0003] 
US3505785A   [0004] 
US20070189944A   [0004] 
US3634588A   [0033] 
US4775520A   [0033]  [0034] 
US4983369A   [0033] 
US4010242A   [0065] 

Superficially porous silica microspheres for fast high-performance liquid chromatography of macromolecules   [0005] 
J. Colloid Interface Sci.   [0034] 
J. Chromatogr.   [0035] 
J. Colloid and Interface Sci.   [0062] 
J. Chromatograr.   [0065] 
J. Chromatogr. A   [0069]