Its manner of articulation is sibilantfricative, which means it is generally produced by channeling air flow along a groove in the back of the tongue up to the place of articulation, at which point it is focused against the sharp edge of the nearly clenched teeth, causing high-frequency turbulence.
Allophonic variation of /ʒ/. Contrasts with other sibilants only in onset. Argued both to be laminal[ʒ], and generally produced "in the middle of the hard palate", same of fellow alveolo-palatal [l̠ʲ] and [n̠ʲ], and further palatalized than Italian post-alveolars. Found in coda mainly before fricative, coronal and palatalized consonants in Brazil. See Portuguese phonology
Landau, Ernestina; Lončarić, Mijo; Horga, Damir; Škarić, Ivo (1999), "Croatian", Handbook of the International Phonetic Association: A guide to the use of the International Phonetic Alphabet, Cambridge: Cambridge University Press, pp. 66–69, ISBN0-521-65236-7
Pop, Sever (1938), Micul Atlas Linguistic Român, Muzeul Limbii Române Cluj