Valenzuela, Lucas M.; Jacoby, George H.; Remus, Rhea-Silvia; Miller Bertolami, Marcelo M.; Méndez, Roberto H. (2025): The PICS project: II. Circumnebular extinction variations and their effect on the planetary nebula luminosity function. Frontiers in Astronomy and Space Sciences, 12: 1709047. ISSN 2296-987X