Bielig, Hans-Joachim Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1002/cber.19560890252/epdf (Any fulltext)
https://dx.doi.org/10.1002/cber.19560890252 (Any fulltext)
Bielig, H.-J., & Reidies, A. (1956). Darstellung von Thioäthern über Pyridiniumsalze. Chemische Berichte, 89(2), 550-562. doi:10.1002/cber.19560890252.