@inbook{d7369e13c84145b59376622ecd1dd199,
title = "What is computation? (How) does nature compute?",
author = "Calude, \{Cristian S.\} and Chaitin, \{Gregory J.\} and Edward Fredkin and Leggett, \{Anthony J.\} and \{de Ruyter\}, Rob and Tommaso Toffoli and Stephen Wolfram",
year = "2012",
month = dec,
doi = "10.1142/9789814374309\_0035",
language = "English (US)",
isbn = "9789814374293",
pages = "673--726",
editor = "Hector Zenil",
booktitle = "A Computable Universe",
publisher = "World Scientific Publishing Co.",
}