@article{197546,
      recid = {197546},
      author = {Maturana, Humberto R., and Varela, Francisco J.,},
      title = {The tree of knowledge : the biological roots of human  understanding /},
      publisher = {Shambhala ;},
      address = {Boston :},
      pages = {269 p. :},
      year = {1992},
      note = {Translation of: El arbol del conocimiento.},
      url = {http://library.usi.edu/record/197546},
}