@article {welch_branch-and-bound_1982,
	title = {Branch-and-bound search for experimental designs based on D optimality and other criteria},
	journal = {Technometrics},
	volume = {24},
	number = {1},
	year = {1982},
	pages = {41{\textendash}48},
	url = {http://www.tandfonline.com/doi/abs/10.1080/00401706.1982.10487707},
	author = {Welch, William J.}
}
