@book{ 0-1607654156, title = {Wagner: a documentary study}, author = {Barth, Herbert and Boulez, Pierre}, editor = {Barth, Herbert}, editor = {Boulez, Pierre}, address = {London}, publisher = {Thames & Hudson}, year = {1975}, isbn = {0500011370}, isbn = {9780500011379}, language = {English}, url = {https://katalog.hgb-leipzig.de/Record/0-1607654156} }