Böttcher, Stefan, Rita Hartel, and Jonathan Rabe. “Efficient XML Keyword Search Based on DAG-Compression.”https://doi.org/10.1007/978-3-319-10073-9_11__In Database and Expert Systems Applications - 25th International Conference, DEXA 2014, 122–37. Cham: Springer, 2014.https://doi.org/10.1007/978-3-319-10073-9_11 .