1. The structure of etamycin;Sheehan;J. Am. Chem. Soc.,1958
2. Isolation of adenosine amino acid esters from a ribo-nuclease digest of soluble, liver ribonucleic acid;Zachau,1958
3. The structures of two serine transfer ribonucleic acids;Zachau;Hoppe-Seyler's Z. Physiol. Chem.,1966
4. Homepage of H. Feldmann: http://www.med.uni-muenchen.de/biochemie/feldmann/; see pages Research.htm or trna ty.htm and SPETSAI.html.
5. Last days in Arcadia, millennium essay;Cairns;Nature,1999