1. Aberhart DJ, Chu JY-R, Neuss N, Nash CH, Occolowitz J, Huckstep LL, De La Higuera N (1974) Retention of valine methyl hydrogens in penicillin biosynthesis. J Chem Soc Chem Commun: 564–565
2. Aberhart DJ, Lin LJ (1974) Studies on the biosynthesis of ß-lactam antibiotics. 1. Stereo-specific synthesis of (2RS,3S)-[4,4,4- 2 H3]-, (2RS,3S)-[4- 3 H]-, (2RS,3R)-[4- 3 H]-, and (2RS,3S)-[4–13C]-valine. Incorporation of (2RS,3S)-[4-’3C]-valine into penicillin V. J Chem Soc Perkin Trans 1: 2320–2326
3. Abraham EP (1974) Biosynthesis and enzymic hydrolysis of penicillins and cephalosporins. University of Tokyo Press, Tokyo
4. Abraham EP (1977) ß-Lactam antibiotics and related substances. Jpn J Antibiot 30: 51–525
5. Abraham EP, Huddleston JA, Jayatilake GS, O’Sullivan J, White RL (1980) Conversion of S-(L-a-aminoadipyl(-L-cysteinyl-D-valine to isopenicillin N in cell-free extracts of Cephalosporium acremonium. In: Gregory GI (ed) Recent advances in the chemistry of ßlactam antibiotics. Royal Society of Chemistry, London, pp 125–134