-<li>\ref free_edges_page "Free edges"</li>
-<li>\ref length_2d_page "Length 2D"</li>
-<li>\ref borders_at_multi_connection_2d_page "Borders at multi-connection 2D"</li>
-<li>\ref area_page "Area"</li>
-<li>\ref taper_page "Taper"</li>
-<li>\ref aspect_ratio_page "Aspect ratio"</li>
-<li>\ref minimum_angle_page "Minimum angle"</li>
-<li>\ref warping_page "Warping"</li>
-<li>\ref skew_page "Skew"</li>
+<li>\subpage free_nodes_page "Free nodes"</li>
+<li>\subpage free_edges_page "Free edges"</li>
+<li>\subpage length_2d_page "Length 2D"</li>
+<li>\subpage borders_at_multi_connection_2d_page "Borders at multi-connection 2D"</li>
+<li>\subpage area_page "Area"</li>
+<li>\subpage taper_page "Taper"</li>
+<li>\subpage aspect_ratio_page "Aspect ratio"</li>
+<li>\subpage minimum_angle_page "Minimum angle"</li>
+<li>\subpage warping_page "Warping"</li>
+<li>\subpage skew_page "Skew"</li>