@staticmethod
def find_neighbors_delaunay(pindex, triang):
    """
        Returns the indexes of points connected to ``pindex`` on the Gabriel
        chain subgraph of the Delaunay triangulation.
        """
    return triang.vertex_neighbor_vertices[1][triang.
        vertex_neighbor_vertices[0][pindex]:triang.vertex_neighbor_vertices
        [0][pindex + 1]]
