Boundary value problems 53 Economics 39 Prices-- Production economics 38 Management 34 Mathematics 32 Philosophy 30 Value 27 Education 23 Differential equations 20 Marxian economics 19 Money 19 History 18 Chemistry 17 Numerical solutions 17 Plant Biotechnology 17 Value education 17 Economic systems and theories 16 Marketing management 16 Value-added tax 15 Data processing 14 Differential equations-- Analysis-- Mathematics 14 Fourier and harmonic analysis 13 Numerical calculations 13 Differential equations, Partial 12 Epistemology 12 Financial management 11 General management 11 Mathematical physics 11 Physics 11 Social Sciences 11