@conference{UBHD-68086800, author={Ambos-Spies, Klaus and Bentzien, Levke and Fejer, Peter A. and Merkle, Wolfgang and Stephan, Frank}, title={Collapsing polynomial-time degrees}, year={2000}, pages={1-24}, language={eng}, isbn={1-56881-113-6 and 1-56881-114-4 and 978-1-56881-114-7 and 978-1-56881-113-0}, }