1. M.J. Duff, R.R. Khuri and J.X. Lu, NI-94-017, CTP/TAMU-67/92, McGill/94/53, CERN-TH.7542/94, (to appear in Physics Reports)
2. Superstrings and solitons
3. Four-dimensional string/string duality
4. A. Giveon, M. Porrati and E. Rabinovici, (to appear in Phys. Rep. C).