Hierarchical Star Formation from the Time-Space Distribution of Star   Clusters in the Large Magellanic Cloud
  The average age difference between pairs of star clusters in the Large Magellanic Clouds increases with their separation as the ~0.35 power. This suggests that star formation is hierarchical in space and time. Small regions form stars quickly and large regions, which often contain the small regions, form stars over a longer period. A similar result found previously for Cepheid variables is statistically less certain than the cluster result. 
Y. N. Efremov (1) and B. G. Elmegreen (2) ((1) MSU, Moscow, (2) IBM   Watson, NY)