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WO0181914A   [0009] 
US4555489A   [0010] 
WO2007132137A   [0011] 
US5077471A   [0012] 
US6670605B   [0013] 
US5789663A   [0014] 
US20060154297A   [0018] 
US20060008850A1   [0019] 
WO02075307A   [0019] 
US2006052251A   [0019] 
EP1277051A   [0093] 

A solid-phase extraction and size-exclusion liquid chromatographic method for polyethylene glycol 25 p-aminobenzoic acid determination in urine: Validation for urinary excretion studies of users of sunscreens   [0015] 
Int. J. of Pharm.   [0017]  [0034]