https://www.google.com/url?q=http://www.teses.usp.br/teses/disponiveis/3/3144/tde-12032012-123926/publico/Tese_Igor_Pierin.pdf&sa=U&ved=0ahUKEwjx4PKry_TeAhXMHZAKHa4WAPMQFggHMAE&client=internal-uds-cse&cx=011662445380875560067:cack5lsxley&usg=AOvVaw33r9NO9k0g_FpX7famMOKs