Meinguer Ledesma, Jorge. “Charles Gerhardt, Precursor of the Second Chemical Revolution”. Didáctica y Educación ISSN 2224-2643 15, no. 1 (January 23, 2024): 84–108. Accessed July 27, 2024. https://revistas.ult.edu.cu/index.php/didascalia/article/view/1766.