@article{article0564c2de,
title   = {A distance scale of planetary nebulae based on mid-infrared data},
author = {Ortiz, Roberto Pereira and Copetti, Marcus Vinicius Fontana and Lorenz-Martins, Silvia},
year = {2011},
doi = {10.1111/j.1365-2966.2011.19619.x},
journal   = {Monthly Notices of the Royal Astronomical Society}
}