The allotropic form of sulphur first discovered by Engel 1 has been variously termed Engel's sulphur, S ɛ, S ρ, S ϕ, trigonal sulphur, and rhombohedral sulphur.The molecule was shown to be ...

University of Novi Sad, Faculty of Technical Sciences, 21000-Novi Sad, Trg D, Obradovica 6, Serbia and Montenegro, Yugoslavia ...