Correction on the paper Triple positive solutions ofn-th order impulsive integro-differential equations

This addendum concerns the paper of the above title found in EJQTDE No. 57 (2011). The example in Section 4 was not correct. The following example is a correction given by the authors. We regret any inconvenience which this may have caused any reader. 1 Correction The example in Section 4 of the original text, i.e. problem (13), is not written correctly. The following example is a correction given by the authors. Consider the second order impulsive integro-differential equation