Paunescu, L., S. M. Axinte, M. F. Dragoescu, and F. Cosmulescu. “Manufacture of Cellular Glass Using Oak Leaves As a Foaming Vegetable Agent”. Journal La Multiapp, Vol. 1, no. 4, Dec. 2020, pp. 18-27, doi:10.37899/journallamultiapp.v1i4.210.