Finding and detecting emotions through face analysis is a unique topic and there are different publications and journal articles available that can be used to analyse this interesting topic. I have been associated with the research industry for the past eight years.
I will use top research journals for this topic. Please check below the name of the 5 articles related to your topic.
1. Busso, C., Deng, Z., Yildirim, S., Bulut, M., Lee, C.M., Kazemzadeh, A., Lee, S., Neumann, U. and Narayanan, S., 2004, October. Analysis of emotion recognition using facial expressions, speech and multimodal information. In Proceedings of the 6th international conference on Multimodal interfaces (pp. 205-211).
2. Soleymani, M., Asghari-Esfeden, S., Fu, Y. and Pantic, M., 2015. Analysis of EEG signals and facial expressions for continuous emotion detection. IEEE Transactions on Affective Computing, 7(1), pp.17-28.
3. Koelstra, S., Muhl, C., Soleymani, M., Lee, J.S., Yazdani, A., Ebrahimi, T., Pun, T., Nijholt, A. and Patras, I., 2011. Deap: A database for emotion analysis; using physiological signals. IEEE transactions on affective computing, 3(1), pp.18-31.
4. Wilson, P.I. and Fernandez, J., 2006. Facial feature detection using Haar classifiers. Journal of Computing Sciences in Colleges, 21(4), pp.127-133.
5. Schupp, H.T., Öhman, A., Junghöfer, M., Weike, A.I., Stockburger, J. and Hamm, A.O., 2004. The facilitated processing of threatening faces: an ERP analysis. Emotion, 4(2), p.189.