1. J. P. Snyder (University of Copenhagen, H. C. ørsted Institute), private communication, 1975
2. Nuclear quadrupole coupling and centrifugal distortion in the microwave spectrum of 1,3,4-thiadiazole
3. An Electron Diffraction Investigation of the Molecular Structure of 1,3,4-Thiadiazole in the Vapour Phase.
4. HOMO, highest occupied molecular orbital; LUMO, lowest unoccupied molecular orbital; PMO, perturbation molecular orbital.