“…Thus, solitary wave solutions behave like solitons, with the characteristics described above. In a more complex scenario, when the NLS equation presents nonintegrability, collision of solitary waves can show a complex structure since the collision outcome can depend on the initial conditions, presenting a fractal pattern [19][20][21][22][23][24][25][26]. Fractal structures in solitons' collisions are also reported in systems described by other equations, such as, in the ϕ 4 model [27,28], the sine-Gordon model [29][30][31][32][33], etc.…”