COMMUNICATIONS FACULTY OF SCIENCES UNIVERSITY OF ANKARA-SERIES A1 MATHEMATICS AND STATISTICS, cilt.61, ss.1-9, 2012 (ESCI İndekslerine Giren Dergi)
Let mu(1) <= mu(2) <= ... <= mu(n) <= ... and lambda(1) <= lambda(2) ... <= lambda(n) <= ... be the eigenvalues of the operatorsL(0)and L which are formed by differential expressions