Soil contamination interpretation using self-organizing maps
by
Tsakovski S., Voyslavov T. and Simeonov V.
Hydrodiplomacy in practice: transboundary water management in northern Greece
by
Mylopoulos Y., Kolokytha E., Vagiona D., Kampragou E. and Eleftheriadou E.
Malaria situation in Bulgaria and surveillance measures (1991-2000)
by
Kurdova R.I., Vutchev D.I. and Petrov P.P.