@Article{crescenzi-jcss15,
  author = {Pierluigi Crescenzi and Daniel Gildea and Andrea Marino and
  Gianluca Rossi and Giorgio Satta},
  title = {Synchronous context-free grammars and optimal linear parsing
  strategies},
  journal = {Journal of Computer and System Sciences},
  year = {2015},
  volume = {81},
  number = {7},
  pages = {1333--1356},
  URL = {http://www.sciencedirect.com/science/article/pii/S0022000015000409}
}