Tom Bylander. Some causal models are deeper than others. Artificial Intelligence in Medicine, 2(3):123-128, 1990. [doi]
@article{Bylander90,
title = {Some causal models are deeper than others},
author = {Tom Bylander},
year = {1990},
doi = {10.1016/0933-3657(90)90042-P},
url = {http://dx.doi.org/10.1016/0933-3657(90)90042-P},
researchr = {https://researchr.org/publication/Bylander90},
cites = {0},
citedby = {0},
journal = {Artificial Intelligence in Medicine},
volume = {2},
number = {3},
pages = {123-128},
}