1. Korovkin-type theorems and approximation by positive linear operators;Altomare;Surv. Approx. Theory,2010
2. On positive linear functionals and operators associated with generalized means;Altomare;J. Math. Anal. Appl.,2021
3. On the convergence of sequences of positive linear operators and functionals on bounded function spaces;Altomare;Proc. Amer. Math. Soc.,2021
4. Korovkin-Type Approximation Theory and Its Applications;Altomare,1994
5. Markov Operators, Positive Semigroups and Approximation Processes;Altomare,2014