11 years since Voyager 1 (2008)
nap.nationalacademies.org
nap.nationalacademies.org
This is a good read by Edward C. Stone
<https://en.wikipedia.org/wiki/Voyager_program>
And the article you're linking appears to have been published in 2008 based on <https://nap.nationalacademies.org/read/12675/chapter/24>:
Specifically: Edward C. Stone, "Voyager’s Journey to the Edge of Interstellar Space", Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, Colorado. April 14, 2008.
Edward C. Stone, Professor of Physics, Caltech; Voyager Project Scientist, JPL National Academies of Sciences, Engineering, and Medicine. 2010. Forging the Future of Space Science: The Next 50 Years. Washington, DC: The National Academies Press. https://doi.org/10.17226/12675.
The submission title also doesn't seem to match the article's title, noted above.
How do you arrive at 11 years ago, and what specific mission or mission-element are you referencing?