Addresses, essays, lectures 16 Study and teaching 7 Underdeveloped areas 7 International economic relations 6 Social aspects 6 History 5 Congresses 4 Education 4 Education, Higher 4 Education, Humanistic 4 Foreign relations 4 Management 4 Science 4 Behavior therapy 3 Chemistry, Analytic 3 Economic aspects 3 Economic conditions 3 International cooperation 3 Technology transfer 3 Aggressiveness (Psychology) 2 American literature 2 Biomedical engineering 2 COMPUTER ART 2 Chemical engineering 2 Chemistry, Organic 2 Cities and towns 2 Cognition 2 Commerce 2 Economic development 2 Economic policy 2