Florisson, O. ., & Huizing, R. . (2005). The Safe Use of the Existing Natural Gas System for Hydrogen (Overview of the Naturalhy-Project). Presented at the. Retrieved from http://www.hydrogen.energy.gov/pdfs/safety_biblio/ichs2005/papers/140024.pdf

De Vries, H. ., Florisson, O. ., & Tiekstra, G. . (2007). Safe Operation of Natural Gas Appliances Fueled with Hydrogen/natural Gas Mixtures (progress Obtained in the Naturalhy-Project). Presented at the. Retrieved from http://www.hydrogen.energy.gov/pdfs/safety_biblio/ichs2007/6.0.00.pdf