@article{Delcheva1997,
author = {Delcheva, E. and Balabanova, D. and McKee, M.},
title= {Under-the-counter payments for health care: Evidence from Bulgaria},
year = {1997},
doi = {10.1016/S0168-8510(97)00061-4},
journal = {Health Policy},
volume = {42},
number = {2},
pages = {89--100},
}