@article {Nistazakis2001157,
	title = {Head-on collisions of ring dark solitons},
	journal = {Physics Letters, Section A: General, Atomic and Solid State Physics},
	volume = {285},
	number = {3-4},
	year = {2001},
	pages = {157-164},
	doi = {10.1016/S0375-9601(01)00320-6},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035796573\&doi=10.1016\%2fS0375-9601\%2801\%2900320-6\&partnerID=40\&md5=c0689889c61685a78683ea3a89187df8},
	author = {Nistazakis, H.E. and Frantzeskakis, DJ and Malomed, B. A. and Kevrekidis, P. G.}
}
