C. Antonov and D. Danchev, Underground waters in Popular Republic of Bulgaria, 1980.

E. Artinian, Modélisation hydrologique du bassin du Rhône. ENM, Météo-France, 1996.

A. Boone and P. Etchevers, An Intercomparison of Three Snow Schemes of Varying Complexity Coupled to the Same Land Surface Model: Local-Scale Evaluation at an Alpine Site, Journal of Hydrometeorology, vol.2, issue.4, pp.374-394, 2001.
DOI : 10.1175/1525-7541(2001)002<0374:AIOTSS>2.0.CO;2

J. Champeaux and H. Legléau, Vegetation mapping over Europe using NOAA/AVHRR, in: The 1995 meteorological satellite data user's conference, pp.139-143, 1995.

Y. Dimitrova, Bulk density and changes depending on the moisture with different mechanical and humus soil composition, Soil science and agrochemistry, XXVI, pp.3-4, 1991.

H. Douville, J. Royer, and J. Mahfouf, A new snow parameterisation for the Météo-France climate model. Part I: Validation in stand-alone experiments, Climate Dyn, pp.21-35, 1995.

E. Dûmenil and L. Todini, A rainfall???runoff scheme for use in the Hamburg climate model, p.462, 1992.
DOI : 10.1016/B978-0-444-89831-9.50016-8

P. Etchevers, C. Golaz, and F. Habets, Simulation of the water budget and the river flows of the Rhone basin from 1981 to 1994, Journal of Hydrology, vol.244, issue.1-2, pp.60-85, 1981.
DOI : 10.1016/S0022-1694(01)00332-8

C. Golaz, P. Etchevers, F. Habets, E. Ledoux, and J. Noilhan, Comparison of two hydrological simulations of the Rhone basin, Phys. Chem. Earth, vol.26, pp.5-6, 2001.

F. Habets, J. Noilhan, C. Golaz, J. P. Goutorbe, P. Lacarrère et al., The ISBA surface scheme in a macroscale hydrological model applied to the Hapex-Mobilhy area, Journal of Hydrology, vol.217, issue.1-2, pp.75-96, 1999.
DOI : 10.1016/S0022-1694(99)00019-0

E. Hershkovich, I. Stephanov, and B. Ganeva, Agro-climatical atlas of Bulgaria, Mean Direction of Hydrology and Meteorology ? Bulgarian Academy of Sciences, 1982.

H. C. Hottel, A Simple Model for Estimating the Transmittance of Direct Solar Radiation Through Clear Atmospheres, Solar Energy, p.129, 1976.

M. Kalinova, Unconfined underground waters, in: Geography of Bulgaria ? Physical Geography, Natural Conditions and Resources, p.259, 1982.

F. Kasten and G. Czeplak, Solar and terrestrial radiation dependent on the amount and type of cloud, Solar Energy, pp.177-189, 1979.

E. Ledoux, G. Girard, and G. Marsily, Spatially distributed modelling: conceptual approach, coupling surface water and groundwater , in: Unsaturated Flow in Hydrologic Modelling Theory and Practice, 1989.

S. Lingova, The regime of the Radiation and the Light in Bulgaria, Bulgarian Academy of Sciences, pp.56-62, 1981.

M. Machkova and D. Dimitrov, Book of reference for the quantitative characteristics of the underground waters for the period, National Institute of Meteorology and Hydrology, 1980.

S. Morel, Modélisation distribuée du bilan hydrique a l'´ echelle régionale: application au bassin Adour Garonne, 2003.

J. E. Nash and J. V. Sutcliffe, River flow forecasting through conceptual models part I ??? A discussion of principles, Journal of Hydrology, vol.10, issue.3, pp.282-290, 1970.
DOI : 10.1016/0022-1694(70)90255-6

N. Ninov, Soils in the mountain area in: Geography of Bulgaria ? Physical Geography, 1982: Natural Conditions and Resources, Bulgarian Academy of Sciences, pp.380-388, 1982.

J. Noilhan and P. Lacarrère, GCM Grid-Scale Evaporation from Mesoscale Modeling, Journal of Climate, vol.8, issue.2, pp.206-223, 1995.
DOI : 10.1175/1520-0442(1995)008<0206:GGSEFM>2.0.CO;2

J. Noilhan and S. Planton, A Simple Parameterization of Land Surface Processes for Meteorological Models, Monthly Weather Review, vol.117, issue.3, pp.536-549, 1989.
DOI : 10.1175/1520-0493(1989)117<0536:ASPOLS>2.0.CO;2

L. A. Richards and C. H. Wadleigh, Soil water and plant growth, in: Soil Physical Conditions and Plant Growth, pp.74-251, 1952.

F. Rousset, F. Habets, E. Gomez, P. Le-moigne, S. Morel et al., Hydrometeorological modeling of the Seine basin using the SAFRAN-ISBA-MODCOU system, Journal of Geophysical Research, vol.19, issue.D24, pp.1410510-1029, 2004.
DOI : 10.1029/2003JD004403

D. Staley and G. Jurica, Effective Atmospheric Emissivity under Clear Skies, Journal of Applied Meteorology, vol.11, issue.2, pp.349-356, 1972.
DOI : 10.1175/1520-0450(1972)011<0349:EAEUCS>2.0.CO;2

N. Troshanov, Hidden discharge evaluation of the North Rhodopes karstic water to the Upper Thracian lowland, Engineering Geology and Hydrogeology, pp.10-27, 1992.

B. Vekilska and M. Kalinova, Snow pack in the West Stara Planina Mountain and its impact on the riverflow, Problems of the Geography of P. R. of Bulgaria 5 Vekilska, B.: Radiation and heat budget in: Geography of Bulgaria Physical geography, Natural conditions and resources, Bulgarian Academy of Sciences, pp.169-171, 1978.

M. Yordanova, Genesis and monthly partition of the riverflow in the East Rhodopy Mountain ? a result from the complex effect of the physical and geographical factors, Thesis, Geographical Institute, Bulgarian Academy of Sciences, 1978.

L. Zyapkov, Water budget of the river basins, in: Geography of Bulgaria ? Physical Geography, 1982: Natural Conditions and Resources, Bulgarian Academy of Sciences, vol.327, 1982.