Otting, Walter Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/cite.330240805/epdf (Any fulltext)
https://dx.doi.org/10.1002/cite.330240805 (Any fulltext)
Otting, W. (1952). Apparatur zur Bestimmung primärer Amino‐Gruppen nach D. D. van Slyke. Chemie-Ingenieur-Technik, 24(8), 452-454. doi:10.1002/cite.330240805.