Jelle Hellings, Marc Gyssens, Yuqing Wu, Dirk Van Gucht, Jan Van den Bussche, Stijn Vansummeren, George H. L. Fletcher. Relative expressive power of downward fragments of navigational query languages on trees and chains. In James Cheney, Thomas Neumann 0001, editors, Proceedings of the 15th Symposium on Database Programming Languages, Pittsburgh, PA, USA, October 25-30, 2015. pages 59-68, ACM, 2015. [doi]
Abstract is missing.