Amaral, A.V.C. do Silva, G.A. da Costa, A.P.A. Coelho, C.M.M. Renzo, R. Laus, J.L. Sildenafil citrate on retrobulbar and retinal circulation of rabbits Subjects--Topical Terms: COELHOOLHOULTRA-SOMCIRCULAÇÃO SANGUÍNEAVETERINÁRIA