Malaria situation in Bulgaria and surveillance measures (1991-2000) by Kurdova R.I., Vutchev D.I. and Petrov P.P.
Reducing CO2 emissions and deregulating the electricity sector in Europe: A contradictory development? by Papadopoulos A.M.
Concentrations of the selected air pollutants at Bily Kriz, the Czech Republic, for 1994 to 1999 by Tshiamala Mbuyi M.-H