R. Hoti, N. Troni, H. Ismaili, G. Mulliqi-Osmani, and V. Thaçi, “Some new [(chromen-4-ylamino)-ethyl]-azetidin-2-ones and their antibacterial activity”, Eur. J. Chem., vol. 8, no. 2, pp. 183–187, Jun. 2017.