I'd like to suggest a book for the Library's collections:

Collision-Based Computing
Adamatzky, Andrew (Ed.)

1st Edition., 2002, XXVIII, 556 p.
Softcover, ISBN 978-1-85233-540-3

http://www.springer.com/computer/theoretical+computer+science/book/978-1...

From the publisher's description: "Collision-Based Computing presents a unique overview of computation with mobile self-localized patterns in non-linear media, including computation in optical media, mathematical models of massively parallel computers, and molecular systems.
It covers such diverse subjects as conservative computation in billiard ball models and its cellular-automaton analogues, implementation of computing devices in lattice gases, Conway's Game of Life and discrete excitable media, theory of particle machines, computation with solitons, logic of ballistic computing, phenomenology of computation, and self-replicating universal computers. "

I'm requesting it because it's contents are relevant to my phd topic.

Thanks,
James.