pid type title authors mentors source_title published_date url doi isbn issn eissn pmf:6320 "journal article" "Semiempirical vs. Ab Initio Calculations of Molecular Properties. Part 3. Electric Field Gradients at 14N Nuclei in some Small Molecules" "Maksić, Zvonimir B.; Primorac, Miljenko; Supek, Selma"