Also from this source

15 Mar, 2017, 16:30 ET GERDAU S.A. - Formulário 20-F


15 Mar, 2017, 16:30 ET GERDAU S.A. - Form 20-F

You just read:

Gerdau S.A. - Form 20-F

News provided by

Gerdau S.A.

31 Mar, 2016, 17:09 ET