Patrizio Cintioli, Riccardo Silvestri. The Helping Hierarchy. ITA, 35(4):367-377, 2001. [doi]
@article{CintioliS01,
title = {The Helping Hierarchy},
author = {Patrizio Cintioli and Riccardo Silvestri},
year = {2001},
doi = {10.1051/ita:2001101},
url = {http://dx.doi.org/10.1051/ita:2001101},
researchr = {https://researchr.org/publication/CintioliS01},
cites = {0},
citedby = {0},
journal = {ITA},
volume = {35},
number = {4},
pages = {367-377},
}