Wieland, Theodor Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/anie.197003152/epdf (Any fulltext)
https://doi.org/10.1002/anie.197003152 (Any fulltext)
Wieland, T. (1970). Syntheses in the cyclopeptide series. Angewandte Chemie International Edition, 9(4), 315-316. doi:10.1002/anie.197003152.