Guenther Wilke (2003). „Fifty Years of Ziegler Catalysts: Consequences and Development of an Invention”. Angewandte Chemie. 42 (41): 5000—5008. PMID14595621. doi:10.1002/anie.200330056.
Guenther Wilke (2003). „Fifty Years of Ziegler Catalysts: Consequences and Development of an Invention”. Angewandte Chemie. 42 (41): 5000—5008. PMID14595621. doi:10.1002/anie.200330056.