Spas D. Kolev. (2018). Seven Years of Membranes: Feature Paper 2017. MDPI - Multidisciplinary Digital Publishing Institute.
Chicago-čujuhus (17. p.)Spas D. Kolev. Seven Years of Membranes: Feature Paper 2017. MDPI - Multidisciplinary Digital Publishing Institute, 2018.
MLA-čujuhus (9. p.)Spas D. Kolev. Seven Years of Membranes: Feature Paper 2017. MDPI - Multidisciplinary Digital Publishing Institute, 2018.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.