@inbook {petkau2003optimal,
	title = {Optimal group sequential designs for the Anscombe-Colton model},
	booktitle = {Mathematical Statistics and Applications: Festschrift for Constance van Eeden},
	volume = {42},
	year = {2003},
	pages = {291{\textendash}315},
	publisher = {IMS Lecture Notes - Monograph Series},
	organization = {IMS Lecture Notes - Monograph Series},
	author = {Petkau, A.John}
}
