2178-5201 2178-5201 S2178-52012017000200175 10.4025/actascieduc.v39i2.31486 Brazil 00 06 2017 00 06 2017 39 2 175 184

2 1 1 167-200 31 1 1 135-51 32 1 1 337-64 14 2 2 134-46 19 1 1 152-70 9 17 17 25-34 17 32 32 23-48