On the rate of convergence of certain approximation operators. Popa, Emil C. — 2002 General Mathematics
On an expansion theorem in the finite operator calculus of G.-C. Rota. Popa, Emil C. — 2008 General Mathematics
Weighted multiplicative integral inequalities. Barza, Sorina; Popa, Emil C. — 2006 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Some multiplicative inequalities for inner products and of the Carlson type. Barza, Sorina; Persson, Lars-Erik; Popa, Emil C. — 2008 Journal of Inequalities and Applications [electronic only]