@article{Drake1977b,
	title = {Klingenberg structures and partial designs I: Congruence relations
	and solutions},
	author = {David A. Drake and Dieter Jungnickel},
	journal = {Journal of Statistical Planning and Inference},
	number = {3},
	pages = {265--287},
	url = {http://www.sciencedirect.com/science/article/B6V0M-45FKSHM-1C/1/888ee0012d9a11efd6b2e9a6c67c3046},
	volume = {1},
	year = {1977},
	biburl = {http://www.bibsonomy.org/bibtex/243399fc6016b423500cd931efa2c5abe/smicha},
	keywords = {imported }
}