Multi-Soliton Interactions and the Inverse Problem of Wave Crests PhD thesis Pearu Peterson Promoters: Prof. Jüri Engelbrecht, DSc, Institute of Cybernetics at TTU Prof. Embrecht van Groesen, DSc Ir, University of Twente, The Netherlands Opponents: Prof. Roger Grimshaw, DSc, Loughborough University, United Kingdom Tarmo Soomere, DSc, Estonian Marine Institute