LECH, Aleksandra. Research and Development Expenditures of Innovative Enterprises in the Time of Crisis. Comparative Economic Research. Central and Eastern Europe, [S. l.], v. 14, n. 3, p. 71–86, 2012. DOI: 10.2478/v10103-011-0019-x. Disponível em: https://www.czasopisma.uni.lodz.pl/CER/article/view/6638. Acesso em: 8 dec. 2025.