by Johnson, Geoffrey, Beausoleil-Morrison, Ian, Strathearn, Bruce, Thorsteinson, Erik, Mackintosh, Tom
Published in Journal of power sources (01.01.2013)

by JAMES MACKINTOSH and TOM WARNER
Published in The Financial times (London ed.) (14.03.2006)

by TOM BRAITHWAITE and JAMES MACKINTOSH
Published in The Financial times (London ed.) (10.02.2006)

by TOM BRAITHWAITE and JAMES MACKINTOSH
Published in The Financial times (London ed.) (09.02.2006)