1. Brazilian Consumer complaints. https://www.consumidor.gov.br
2. Brazilian Higher Education Census. https://www.gov.br/inep/pt-br/areas-de-atuacao/pesquisas-estatisticas-e-indicadores/censo-da-educacao-superior/resultados
3. Data from Consumidor.gov.br - Datasets - Brazilian Open Data Portal. https://dados.gov.br/dataset/reclamacoes-do-consumidor-gov-br1
4. Allahyari, M., et al.: A Brief Survey of Text Mining: Classification, Clustering and Extraction Techniques (2017)
5. Management for Professionals;R Alt,2020