Mathematical.

The economics of imperfect competition Robinson, Joan 1933 The economics of imperfect competition Robinson, Joan 1969 The fecundity of mathematical methods in economic theory Brand, Heinz Willi 1961 The mathematical papers of Sir William Rowan Hamiltion Royal Irish Academy 1931 The mechanism of economic systems Tustin, Arnold 1957 The mechanism of economic systems Tustin, Arnold 1957 The pure theory of foreign trade Marshall, Alfred 1930 The structure of economics Silberberg, Eugene 2001 The structure of economics Silberberg, Eugene 1990 The Structure of economics: a mathematical analusis Silberberg, Eugene 1981 The theory of monopolistic competition Chamberlin, Edward 1962 The theory of monopolistic competition Chamberlin, Edward 1956 The theory of monopolistic competition Chamberlin, Edward 1946 The third dimension in chemistry Wells, A. F. 1956 Theory and policy of accounting prices Qayum, Abdul 1960 Theory and problems of dvanced mathematics for engineers and scienists Spiegel, M.R. 1983 Theory and problems of introduction to mathematical economics Edward T. Dowling 1992 Theory and problems of mathematics for economists Edward T. Dowling 1986 Theory of economic dynamics Kalecki, Michał 1954 Theory of games and economic behavior Von Neumann, John 2007