Wielen, R. (1972). On the lifetimes of galactic clusters. Gravitational N-body problem.
Chicago Style (17th ed.) CitationWielen, Roland. "On the Lifetimes of Galactic Clusters." Gravitational N-body Problem 1972.
MLA (9th ed.) CitationWielen, Roland. "On the Lifetimes of Galactic Clusters." Gravitational N-body Problem, 1972.
Warning: These citations may not always be 100% accurate.