This catalog was made from SDSS DR7. If you
plan on using the catalog, please cite
Pan, D. C., Vogeley, M. S., Hoyle, F., Choi, Y.-Y. and Park, C. (2012), Cosmic voids in Sloan Digital Sky Survey Data Release 7. Monthly Notices of the Royal Astronomical Society, 421: 926–934. doi: 10.1111/j.1365-2966.2011.20197.x
How to read the files