1. Appel, O., Chiclana, F., Carter, J., & Fujita, H. (2018). Successes and challenges in developing a hybrid approach to sentiment analysis.Applied Intelligence, 48(5), 1176–1188.
2. Levels of sentiment analysis and its challenges: A literature review
3. Bhonde, R., Bhagwat, B., Ingulkar, S., & Pande, A. (2015). Sentiment Analysis Based on Dictionary Approach.International Journal of Emerging Engineering Research and Technology, 3(1), 51–55.
4. Sentiment analysis for bank service quality: A rule-based classifier
5. Evans, B. (2017). The Top 5 Cloud-Computing Vendors: #1 Microsoft, #2 Amazon, #3 IBM, #4 Salesforce, #5 SAP. Forbes. Retrieved from https://www.forbes.com/sites/bobevans1/2017/11/07/the-top-5-cloud-computing-vendors-1-microsoft-2-amazon-3-ibm-4-salesforce-5-sap/#75cd88c56f2e