RT Article T1 Evolving Notions of Facet Theory JF Trends and perspectives in empirical social research SP 178 OP 200 A1 Borg, Ingwer 1945- LA English YR 1994 UL https://krimdok.uni-tuebingen.de/Record/1525884921 SN 3110143127 K1 Facettentheorie