@article{lee-smi-smi-07-aggreg,
  author = {J. R. J. Lee and M. L. Smith and L. N. Smith}, 
  title = {A New Approach to the Three-Dimensional Quantification of Angularity using Image Analysis of the Size and Form of Coarse Aggregates},
  journal = {Engineering Geology},
  volume = {91},
  pages = {254--264},
  year = 2007
}