@article {chen1991identity,
	title = {On the identity relationships of 2- p designs},
	journal = {Journal of statistical planning and inference},
	volume = {28},
	number = {1},
	year = {1991},
	pages = {95{\textendash}98},
	publisher = {North-Holland},
	author = {Chen, Jiahua and Lin, Dennis KJ}
}
