Ball, Jeffrey; et al. (21 مارس 2017). "The New Solar System - Executive Summary"(PDF). Stanford University Law School, Steyer-Taylor Center for Energy Policy and Finance. Archived(PDF) from the original on 20 April 2017. Retrieved 27 June 2017.
Ball, Jeffrey; et al. (21 مارس 2017). "The New Solar System - Executive Summary"(PDF). Stanford University Law School, Steyer-Taylor Center for Energy Policy and Finance. Archived(PDF) from the original on 20 April 2017. Retrieved 27 June 2017.