@book{UBHD-1063613, author={Hughes, George Edward and Cresswell, M. J.}, title={An introduction to modal logic}, edition={Reprint}, publisher={Methuen}, address={London}, year={1974}, pages={388 S}, language={eng}, isbn={0-416-29470-7 and 0-416-29460-X and 978-0-416-29470-5 and 978-0-416-29460-6}, number={ARRAY(0x5649935cb870)}, series={University paperbacks}, library={UB [Signatur: 77 A 1584]}, }