REDDY, G.Thirupati. Efficiency Scores Analysis of Coal Mines using IRS, DRS and Cross Efficiency Models. Journal of Advance Research in Mechanical and Civil Engineering (ISSN: 2208-2379), [S. l.], v. 2, n. 2, p. 01–07, 2015. DOI: 10.53555/nnmce.v2i2.367. Disponível em: https://nnpub.org/index.php/MCE/article/view/367.. Acesso em: 18 may. 2024.