Some overview links:
{ Author: Humberto R. Maturana (deceased)
Constuctivist Foundations
Constructivist Foundations Author Humberto R. Maturana
Autopoeisis and cognition: the realization of the living – Maturana and Varela
With a preface to ‘Autopoiesis’ by Stafford Beer
Humberto Maturana in Systems Thinkers: Ramage and Shipp (pdf)
https://link.springer.com.sci-hub.se/chapter/10.1007/978-1-84882-525-3_21
An introduction to some of the ideas of Humberto Maturana – Maureen L. Leyland (pdf)
https://onlinelibrary.wiley.com/doi/pdf/10.1046/j..1988.00323.x
At the age of 92, Humberto Maturana, biologist, National Science Prize winner and creator of the applauded concept of autopoiesis, passes away
https://www.latercera.com/que-pasa/noticia/a-los-92-anos-fallece-humberto-maturana-biologo-premio-nacional-de-ciencias-y-creador-del-aplaudido-concepto-de-la-autopoiesis/2LTSTIRC4BFX3FWF75LT4OETSA/
Wikipedia: https://en.wikipedia.org/wiki/Humberto_Maturana