Nobrega, D. G. de A. (2012). <b>Students’ spontaneous smile in the EFL classroom</b&gt; - doi: 10.4025/actascilangcult.v34i2.15352. Acta Scientiarum. Language and Culture, 34(2), 233-240. https://doi.org/10.4025/actascilangcult.v34i2.15352