@article{noteoncombinatorialengineeringframeworks,
  title = {Note on Combinatorial Engineering Frameworks for Hierarchical Modular Systems},
  author = {Mark Sh. Levin},
  year = {2013},
  eprint = {1304.0030},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1304.0030v1},
}