Use of the three-electrode electrical sounding as an effective and highly-informative method for shallow depth investigations; 3D digital model of Southwest Bulgaria – the area of Struma river basin; Development of southern Bulgarian Black Sea coast during the last 8 000 years; Geophysical prospecting and reconstruction of ancient settlement Promahon-Topolnica; Prospecting of tumuli and ancient necropolis using electrical methods. – In: 3-rd Balkan Geophysical Congress and Exhibition (24-28 June 2002, Sofia). Sofia, 2002, 97-98; 130-131; 371-373; 374-375; 376.