@article {kaganovich1999variable,
	title = {Variable profile capillary discharge for improved phase matching in a laser wakefield accelerator},
	journal = {Applied physics letters},
	volume = {75},
	number = {6},
	year = {1999},
	pages = {772{\textendash}774},
	publisher = {American Institute of Physics},
	author = {Kaganovich, D and Sasorov, P and Cohen, C and Zigler, A}
}
