@article{compref22,
   author = {Atlan,H},
   year = {1987},
   title = {The Self-Creation of Meaning},
   journal = {Physica Scripta},
   volume = {36},
   pages = {563}
}

@incollection{compref21,
   author = {Atlan,H},
   year = {1984},
   title = {Natural Complexity and the Self-Creation of Meaning},
   booktitle = {The Science and Praxis of Complexity},
   editor = {Aida,et al},
   publisher = {United Nations University},
   address = {Tokyo},
   pages = {173-192}
}