Drashner, Todd; Sandberg, Anders; Kazlev, M. Alan (20 November 2001). "Dyson Trees". Orion's Arm - Encyclopedia Galactica. Archived from the original on 7 December 2022. Retrieved 15 June 2023.
Kazlev, M. Alan (17 December 2001). "Orwoods". Orion's Arm - Encyclopedia Galactica. Archived from the original on 9 December 2022. Retrieved 15 June 2023.
Drashner, Todd; Sandberg, Anders; Kazlev, M. Alan (20 November 2001). "Dyson Trees". Orion's Arm - Encyclopedia Galactica. Archived from the original on 7 December 2022. Retrieved 15 June 2023.
Kazlev, M. Alan (17 December 2001). "Orwoods". Orion's Arm - Encyclopedia Galactica. Archived from the original on 9 December 2022. Retrieved 15 June 2023.