. "Urea"@it . "2008-07-11" . . . . . "Carbamide"@it . . "Carbammide"@it . . "Diamide carbonica"@it . . . . . . . . . . . . . . . "FONTE: Soggettario; Treccani.it; DeM; PT; AGROVOC; CIS-ISPESL; MB; MESH(IT); NASA; WebDewey(IT); Wikipedia(IT)" . "668.4223"^^ .