Paul E. Meehl & Wilfrid Sellars, Stephen C. Pepper
Here are a couple of older articles:
Pepper, Stephen C. “Emergence,” Journal of Philosophy 23 (1926): 241-45.
Sellars; Wilfrid; Meehl, Paul E. “The Concept of Emergence,” in Minnesota Studies in The Philosophy of Science, Vol. I: The Foundations of Science and the Concepts of Psychology and Psychoanalysis, edited by Herbert Feigl and Michael […]