Hendrawati, T., & 		Yanti, C.
(2021).
 Analysis of Twitter Users Sentiment against the Covid-19 Outbreak Using the Backpropagation Method with Adam Optimization.
<em>Journal Of Electrical, Electronics And Informatics, 5</em>(1), 1-4.
doi:10.24843/JEEI.2021.v05.i01.p01