@inproceedings {Risch95,
author = {V. Risch},
title = {Yet Some More Considerations on Cumulativity in Default Logics},
booktitle = {Proceedings of the third European Conference on Symbolic and Quantitative Approaches to Reasoning ans Uncertainty, ECSQARU'95},
address = {Fribourg, Swiss},
editor = {Froidevaux C. and Kohlas J.},
series = {Lecture Notes in Artificial Intelligence},
number = 946,
publisher = {Springer Verlag},
year = 1995,
pages = {364--378}
}