@article{Uddin1996,
	title = {E-optimal incomplete block designs with two distinct block sizes},
	author = {Nizam Uddin},
	day = {30},
	journal = {Journal of Statistical Planning and Inference},
	month = {Oct},
	number = {2},
	pages = {235--248},
	url = {http://www.sciencedirect.com/science/article/B6V0M-3WP2CJ6-8/1/171cb2686877569d439b8192a993ee52},
	volume = {55},
	year = {1996},
	biburl = {http://www.bibsonomy.org/bibtex/286917b0180a5d9ea26acd6cd9ccd2c51/smicha},
	keywords = {A-efficiency }
}