@inproceedings{macavaney:sigir2018-car,
  author = {MacAvaney, Sean and Yates, Andrew and Cohan, Arman and Soldaini, Luca and Hui, Kai and Goharian, Nazli and Frieder, Ophir},
  title = {Characterizing Question Facets for Complex Answer Retrieval},
  booktitle = {Proceedings of the 41st International ACM SIGIR Conference on Research and Development in Information Retrieval},
  year = {2018},
  url = {https://arxiv.org/abs/1805.00791},
  doi = {10.1145/3209978.3210135},
  pages = {1205--1208}
}