@article{overbey05keyspace,
	Author = {Jeffrey L. Overbey and William Traves and Jerzy Wojdylo},
	Doi = {10.1080/0161-110591893771},
	Journal = {Cryptologia},
	Number = {1},
	Pages = {59--72},
	Title = {On the Keyspace of the {H}ill Cipher},
	Volume = {29},
	Year = {2005}}