Links
[1] http://design.rootiers.it/strutture/taxonomy/term/2
[2] http://design.rootiers.it/strutture/taxonomy/term/16
[3] http://design.rootiers.it/strutture/sites/default/files/users/letizia.gagliardi//2013/esercizio%20sulla%20trave%20reticolare%20su%20sap.pdf
[4] http://design.rootiers.it/strutture/sites/default/files/users/letizia.gagliardi/SdC%28b%29_%28LM_PA%29/2013/tabella.jpg