"Odd and Even Two-Dimensional Dark Spatial Solitons",

S. Baluschev, A. Dreischuh, I. Velchev, S. Dinev and O. Marazov,
Appl. Phys. B61, pp. 121-124 (1995)

"Generation and Evolution of Two-Dimensional Dark Spatial Solitons"

S. Baluschev, A. Dreischuh, I. Velchev, S. Dinev and O. Marazov,
Phys. Rev. E52, pp. 5517-5523 (1995)

"Phase Measurements of Ring Dark Solitons"

A. Dreischuh, W. Fliesser, I. Velchev, S. Dinev, and L. Windholz,
Appl. Phys. B62, pp. 139-142 (1996)

"Interaction of Optical Vortex-Solitons Superimposed on Different Background Beams"

I. Velchev, A. Dreischuh, D. Neshev and S. Dinev,
Opt. Commun. 130, pp. 385-392 (1996)

"Two-Dimensional Dark Spatial Solitons"

A. Dreschuh, S. Baluschev, I. Velchev, D. Neshev, S. Dinev and O. Marazov
Proceedings of VIII School on Quantum Electronics, Lasers and Applications
pp. 327-332 (1996) M. Nenchev, P. Atanasov, and M. Himber (eds.), University Paris-Nord, Paris

"Topological-charge controlled interaction within ordered structures of optical vortex solitons"

M. Assa, I. Velchev, D. Neshev, A. Dreschuh, S. Dinev,
Proc. SPIE 3502, pp. 218-222 (1997)

"Multiple-Charged Optical Vortex Solitons in Bulk Kerr Media"

I. Velchev, A. Dreischuh, D, Neschev, S. Dinev,
Opt. Commun. 140, pp. 77-82 (1997)

"A Dense Grid Of Reference Iodine Lines For Optical Frequency Calibration In The Range 571-596nm"

I. Velchev, R. van Dierendonck, W. Hogervorst and W. Ubachs
Journal of Molecular Spectroscopy 187, pp. 21-27 (1998)

"SBS pulse compression to 200 ps in a compact single-cell setup"

D. Neshev, I. Velchev, W. A. Majewski, W. Hogervorst and W. Ubachs
Applied Physics B68, pp.671-675 (1999)