1. Living systems are smarter bots: Slime mold semiosis versus AI symbol manipulation;Alexander,2021
2. The Organic Codes: an Introduction to Semantic Biology;Barbieri,2002
3. Three types of semiosis;Barbieri;Biosemiotics,2009
4. A mechanistic model of meaning;Barbieri;Biosemiotics,2011
5. Code biology – a new science of life;Barbieri;Biosemiotics,2012