@article{700278,
title = {Abstract differential equations of arbitrary (fractional) orders},
booktitle = {Proceedings of Equadiff 9},
series = {GDML\_Books},
publisher = {Masaryk University},
address = {Brno},
year = {1998},
pages = {93-99},
url = {http://dml.mathdoc.fr/item/700278}
}
El-Sayed, Ahmed M. A. Abstract differential equations of arbitrary (fractional) orders, dans Proceedings of Equadiff 9, GDML_Books, (1998), pp. 93-99. http://gdmltest.u-ga.fr/item/700278/