@misc{OPUS4-987, title = {T{\"a}tigkeitsbericht 1986}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-9871}, number = {1986}, language = {de} } @misc{OPUS4-988, title = {T{\"a}tigkeitsbericht 1985}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-9885}, number = {1985}, language = {de} }