Innovation Activities of Enterprises of the Coal Industry to Improve Productivity. Baltic Journal of Real Estate Economics and Construction Management, [S. l.], v. 2, p. 11–15, 2015. DOI: 10.7250/bjreecm.2014.002. Disponível em: https://bjreecm-journals.rtu.lv/bjreecm/article/view/bjreecm.2014.002.. Acesso em: 7 mar. 2026.