1) (a) NAGARAJAN, R.; D. BOECK, M. GORMAN, R. L. HAMILL, C. E. HIGGENS, M. HOEN, W. M. STARK & J. WHITENEY: β-Lactam antibiotics from <i>Streptomyces</i>. J. Am. Chem. Soc. 88: 2308-2310, 1971
(b) MILLER, T. W.; R. T. GOEGELMAN, R. G. WESTON, I. PUTTER & F. J. WOLF: Cephamycins, a new family of β-lactam antibiotics. II. Isolation and chemical characterization. Antimicr. Agents & Chemoth. 2: 132-135, 1972
(c) HIGGENS, C. E.; R. L. HAMILL, T. H. SANDS, M. M. HOEHN, N. E. DAVIS, R. NAGARAJAN & L. D. BOECK: The occurrence of deacetoxycephalosporin C in fungi and <i>Streptomycetes</i>. J. Antibiotics 27: 298-300, 1974
(d) KITANO, K.; K. KINTAKA, S. SUZUKI, K. KATAMOTO, k. NARA & Y. NAKANO: Production of cephalosporin antibiotics by strains belonging to the genera <i>Arachnomyces, Antixiopsis</i> and <i>Spiroidium</i>. Agr. Biol. Chem. 38: 1761-1762, 1974