1. Elkund L 2009 Intl. Patent WO2009/044143
2. Kretzschmar G, Kraft V, Rossen K and Graser J 2010 Intl. Patent WO2010/136502
3. Hansson O, Bergh A and Elkund L 2010 Intl. Patent WO2010/116140
4. Wellig A, Roduit J P, Dai D and Chen R 2010 Intl. Patent WO2010/040261
5. Elkund L 2010 Intl. Patent WO2010/038029