The paper has two parts and both of them should be written by each student individually. You may work together in understanding the material, but should submit separate papers.
In the first part (at most 2 pages) give the definitions of fractal, box counting dimension and self-similarity. You may use other sources but make sure you include them as bibliography. You'll see that there is no one definition of fractal universally accepted, and you should discuss this point as well.
In the second part, do the computation of the box counting dimension of the fractal of your project (Students of Group 3, compute the dimension of this fractal).