@inproceedings{joo_park_2015, 
  title={A Level-wise Hierarchical Document Clustering method for Categorization}, 
  DOI={10.14257/astl.2015.99.22}, 
  publisher={Science & Engineering Research Support soCiety}, 
  author={Joo and Park}, 
  year={2015}, 
  month={Jul}
  }