This is a brilliant magazine published by the EM people in Germany. They put out four issues a year and have been doing so for many years. Unfortunately it’s only been available in German up until now in printed form but as of 2015 it will be available in English (with a few months delay for each edition). If you can read German, you can subscribe on the magazine and have it delivered directly, back copies are also available. Here’s the link: www.emev.de.