Kundurjiev, T. and Salchev, Petko (2011): Technical efficiency of hospital psychiatric care in Bulgaria – assessment using Data Envelopment Analysis. Unpublished.
Salchev, Petko and Hristov, Nikolai (2010): Stress test of hospitals in Bulgaria - proposed methodology. Unpublished.
Salchev, Petko; Hristov, Nikolai and Georgieva, Lydia (2010): Possible approaches to benchmarking voluntary health insurance funds in Bulgaria. Unpublished.
