Ben A. Calloni, John McGowan, Randall Stanley. Open Source Software: Free is not Exactly Inexpensive. JACIC, 4(9):986-995, 2007. [doi]
@article{CalloniMS07,
title = {Open Source Software: Free is not Exactly Inexpensive},
author = {Ben A. Calloni and John McGowan and Randall Stanley},
year = {2007},
doi = {10.2514/1.23080},
url = {http://dx.doi.org/10.2514/1.23080},
researchr = {https://researchr.org/publication/CalloniMS07},
cites = {0},
citedby = {0},
journal = {JACIC},
volume = {4},
number = {9},
pages = {986-995},
}