D. Pupaki, S. Bachurska, D. Parvanov, D. Ankova, and P. Rashev, “Association between the Expression of KISS1, KISS1R and MMP-9 in Invasive Breast Carcinomas”, C. R. Acad. Bulg. Sci., vol. 75, no. 10, pp. 1514–1521, Oct. 2022.