Caltaru , Mihaela, Nicolae Petrescu, и Cristina Vasiliu. 2006. Записки Горного института 167 (2), 135-38. https://pmi.spmi.ru/pmi/article/view/7980.

Caltaru , Mihaela, Nicolae Petrescu, and Cristina Vasiliu. 2006. “Copper Extraction from Diluted Solutions Using Hollow Fiber Supported Liquid Membranes”. Journal of Mining Institute 167 (2), 135-38. https://pmi.spmi.ru/pmi/article/view/7980.