@inproceedings{EndrissGabbayESSLLI2003, author = {Ulle Endriss and Dov Gabbay}, title = {Halfway between Points and Intervals: A Temporal Logic Based on Ordered Trees}, editor = {V.~Goranko and A.~Montanari}, booktitle = {ESSLLI Workshop on Interval Temporal Logics and Duration Calculi}, pages = {100--109}, month = {August}, year = {2003} }