Effective pain management and EOL

Looking for EBP articles dealing with pain management in terminally ill patients....not just CA patients. Having an "issue" with some nurses I work with not treating pain in these patients....and labeling them as drug seekers. Even had one nurse "question" my practice because I gave ativan and morphine to a patient dying of end-stage COPD. I'm not going to change MY practice....but would like some hard information so that maybe I can change THEIR practice.