J. Minov, S. Stoleski, T. Petrova, K. Vasilevska, D. Mijakoski, and J. Karadzinska-Bislimovska, “Effects of A Long-Term Use of Carbocysteine on Frequency and Duration of Exacerbations in Patients with Bronchiectasis”, Open Access Maced J Med Sci, vol. 7, no. 23, pp. 4030–4035, Dec. 2019.