A discussion of prodrugs is provided in T. Higuchi and V. Stella, Pro drugs as {HEAD ~ Novel Delivery Systems} 14 of {TAIL ~ the A.C.S. Symposium Series}, and in Bioreversible Carriers in Drug Design, Edward B. Roche, ed., American Pharmaceutical Association and Pergamon Press 
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A discussion of prodrugs is provided in T. Higuchi and V. Stella , Pro drugs as { HEAD ~ Novel Delivery Systems } 14 of { TAIL ~ the A.C.S. Symposium Series } , and in Bioreversible Carriers in Drug Design , Edward B. Roche , ed . , American Pharmaceutical Association and Pergamon Press
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