Matthias Blume, Andrew W. Appel. Hierarchical modularity. ACM Transactions on Programming Languages and Systems, 21(4):813-847, 1999. [doi]
@article{BlumeA99,
title = {Hierarchical modularity},
author = {Matthias Blume and Andrew W. Appel},
year = {1999},
doi = {10.1145/325478.325518},
url = {http://doi.acm.org/10.1145/325478.325518},
researchr = {https://researchr.org/publication/BlumeA99},
cites = {0},
citedby = {0},
journal = {ACM Transactions on Programming Languages and Systems},
volume = {21},
number = {4},
pages = {813-847},
}