1. Means and Their Inequalities;Bullen,1988
2. Inequalities Complementary to the Cauchy-Schwarz Inequality for Finite Sums of Quaternions; Refinements of the Cauchy-Schwarz Inequality for Finite Sums of Real Numbers; Inequalities Concercing Ratios and Differences of Generalized Means of Different Order;McLaughlin;University of Maryland, Technical Note BN-454,1966
3. Analytic Inequalities;Mitrinović,1970