To understand the bipartite vs column-intersection graph models, let's consider the arrow shaped matrix, in which the first row, the first column and the main diagonal are filled with nonzero elements and the other elements are zeros.
- arrow-shaped.mtx
- arrow-shaped_plus_one.mtx (from Lülfesmann's dissertation )
- arrow-shaped_plus_one_minus_one.mtx (from Lülfesmann's dissertation )
