S
[Sch16] Sylvain Schmitz. Complexity Hierarchies Beyond Elementary. ACM Transactions on Computation Theory 8(1):3:1-3:36. ACM Press, February 2016. 
@article{toct8(1)-Sch,
  author =              {Schmitz, Sylvain},
  title =               {Complexity Hierarchies Beyond Elementary},
  publisher =           {ACM Press},
  journal =             {ACM Transactions on Computation Theory},
  volume =              {8},
  number =              {1},
  pages =               {3:1-3:36},
  year =                {2016},
  month =               feb,
  doi =                 {10.1145/2858784},
}
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