Isomorph Letters (A) 1 (2007): H. Grassmann - On the mathematical structure of messages and message processing systems
Isomorph Letters (B) 1 (2008): H. Grassmann, M. Salvagni, A. Prest - The Linear Mirror
Isomorph Letters (B) 2 (2009): H. Grassmann - Open Questions regarding the Desertec Project
Isomorph Letters (C) 1 (2011): H. Grassmann - Comments on a systematic uncertainty in the measurement of the neutrino velocity by the OPERA experiment
Isomorph Letters (B) 3 (2011): Isomorph Holding AG - The solar wall