1. Knudsen, E. T., Rolinson, G. N., Sutherland, R. Carbenicillin: A new semi-synthetic penicillin active againstPseudomonas pyocyanea. Br. Med. J. 3 (1967) 75–78.
2. Neu, H. C., Winshell, E. B. In vitro studies of a semi-synthetic penicillin, 6-(D(-)-a-carboxy-3-thienylacetamido) penicillanic acid (BRL 2288), active againstPseudomonas. Antimicrob. Agents Chemother. 1970 (1971) 385–389.
3. Sutherland, R., Burnett, J., Rolinson, G. N. a-Carboxy-3-thienylmethyl-penicillin (BRL 2288), a new semi-synthetic penicillin: In vitro evaluation. Antimicrob. Agents Chemother. 1970 (1971) 390–395.
4. Bodey, G. P., Rodriguez, V., Weaver, S. Pirbenicillin, a new semi-synthetic penicillin with broad-spectrum activity. Antimicrob. Agents Chemother. 9 (1976) 668–674.
5. Fu, K. P., Neu, H. C. Piperacillin, a new penicillin active against many bacteria resistant to other penicillins. Antimicrob. Agents Chemother. 13 (1978a) 358–367.