Spatial solitons supported by localized gain in nonlinear optical waveguides C.-K. Lam, C.-K. Lam, B. A. Malomed, B.A. Malomed, K.W. Chow, K. W. Chow, P.K.A. Wai and P. K.A. Wai Eur. Phys. J. Special Topics, 173 (2009) 233-243 Published online: 27 June 2009 DOI: 10.1140/epjst/e2009-01076-8