Atanassova I., Benkova M., Raichev T., Józefaciuk G.:  Analysis of a technogenically degraded soil using a rapid method for clay fraction separation (2004 r.) International Conference "Agroecological Interrelations of Physicochemical and Physical Parameters of Soils and Plants. Methods and Applications", Sofia, 21.09.2004 r. 2004, International Conference "Agroecological Interrelations of Physicochemical and Physical Parameters of Soils and Plants. Methods and Applications", Sofia, 21.09.2004 r. - referat 

Raichev T., Arsova A., Popandova S., Sokołowska Z., Hajnos M., Józefaciuk G.:  Effect of coal powder and liming on arsenic uptake by alfalfa from Cu and As polluted acidic soil. (2001 r.) Polish Journal of Soil Science 2001, XXXIV/1, 9-15 

Raichev T., Arsova A., Popandova S., Sokołowska Z., Hajnos M., Józefaciuk G.:  Wpływ wapnowania i pyłu węglowego na wzrost i pobór arsenu przez lucernę. (2000 r.) II Zjazd Naukowy Polskiego Towarzystwa Agrofizycznego, Lublin, 11-12.09.2000 r. 2000,

Raichev T., Arsova A., Popandova S., Józefaciuk G.:  Effect of application of coal powder and lime on alfalfa growth on copper polluted acidic soil. (2000 r.) International Agrophysics 2000, 14, 1, 121-126 

Popandova S., Raichev T., Arsova A., Józefaciuk G., Hajnos M., Sokołowska Z.:  Effect of colloid-chemical melioration of saline soil. (1998 r.) Bulgarian Journal of Agricultural Science 1998, 4, 153-158