Heiner Gonska, Ioan Raşa, Differences of positive linear operators and the second order modulus, Carpathian Journal of Mathematics, Vol. 24, No. 3, SPECIAL ISSUE INCLUDING SELECTED PAPAERS PRESENTED ...

SHU TANG LIU, BING GEN ZHANG, GUANRONG CHEN, ASYMPTOTIC BEHAVIOR AND OSCILLATION OF DELAY PARTIAL DIFFERENCE EQUATIONS WITH POSITIVE AND NEGATIVE COEFFICIENTS, The Rocky Mountain Journal of ...