Meinguer Ledesma, Jorge. “Charles Gerhardt, Precursor of the Second Chemical Revolution”. Didáctica y Educación ISSN 2224-2643 14, no. 6 (December 14, 2023): 167–192. Accessed May 20, 2024. https://revistas.ult.edu.cu/index.php/didascalia/article/view/1765.