The major evolutionary transitions. Szathmáry, E. & Smith, J. M. Nature, 374(6519):227-32, 1995.
doi  abstract   bibtex   
There is no theoretical reason to expect evolutionary lineages to increase in complexity with time, and no empirical evidence that they do so. Nevertheless, eukaryotic cells are more complex than prokaryotic ones, animals and plants are more complex than protists, and so on. This increase in complexity may have been achieved as a result of a series of major evolutionary transitions. These involved changes in the way information is stored and transmitted.
@Article{Szathmary1995,
  author   = {E. Szathm\'ary and J. M. Smith},
  journal  = {Nature},
  title    = {The major evolutionary transitions.},
  year     = {1995},
  number   = {6519},
  pages    = {227-32},
  volume   = {374},
  abstract = {There is no theoretical reason to expect evolutionary lineages to
	increase in complexity with time, and no empirical evidence that
	they do so. Nevertheless, eukaryotic cells are more complex than
	prokaryotic ones, animals and plants are more complex than protists,
	and so on. This increase in complexity may have been achieved as
	a result of a series of major evolutionary transitions. These involved
	changes in the way information is stored and transmitted.},
  doi      = {10.1038/374227a0},
  keywords = {Animals, Evolution, Genetic, Humans, Models, Plants, Prokaryotic Cells, Reproduction, 7885442},
}

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