H
[Hig52] Graham Higman. Ordering by Divisibility in Abstract Algebras. Proceedings of the London Mathematical Society s3-2(1):326-336. 1952. 
@article{plms-s3-2(1)-Hig,
  author =              {Higman, Graham},
  title =               {Ordering by Divisibility in Abstract Algebras},
  journal =             {Proceedings of the London Mathematical Society},
  volume =              {s3-2},
  number =              {1},
  pages =               {326-336},
  year =                {1952},
}
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