Editable Biblio is accessible from the internal network (or through VPN):

Jiří Mírovský, Lucie Poláková, Jan Štěpánek (2016): Searching in the Penn Discourse Treebank Using the PML-Tree Query. In: Proceedings of the 10th International Conference on Language Resources and Evaluation (LREC 2016), pp. 1762-1769, European Language Resources Association, Paris, France, ISBN 978-2-9517408-9-1 (url, local PDF, bibtex)