@article{DBLP:journals/tochi/HahnK99,
  author    = {Jungpil Hahn and
               Jinwoo Kim},
  title     = {Why are some diagrams easier to work with? Effects of diagrammatic
               representation on the cognitive intergration process of
               systems analysis and design},
  journal   = {ACM Trans. Comput.-Hum. Interact.},
  volume    = {6},
  number    = {3},
  year      = {1999},
  pages     = {181-213},
  ee        = {http://doi.acm.org/10.1145/329693.329694},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}