@book{162181,
	author = {Burck, Charlotte, and ebrary, Inc.},
	title = {Positions and polarities in contemporary systemic practice},
	publisher = {Karnac,},
	year = {2013.},
	series = {Systemic thinking and practice series},
	address = {London :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10641036}
}