@article {27379,
	title = {PT-symmetry breaking in waveguides with competing loss-gain pairs},
	journal = {PHYSICAL REVIEW A},
	volume = {93},
	year = {2016},
	month = {2016},
	isbn = {2469-99262469-9934},
	author = {Kalozoumis, P. A. and Morfonios, C. V. and Diakonos, F. K. and Schmelcher, P.}
}
