arXiv:2003.08067 [astro-ph.SR]AbstractReferencesReviewsResources Classifications Subjects Themes Keywords bipolar planetary nebulae, preferred orientation angle, astronomical observatory/strasbourg observatory h-alpha, kong/australian astronomical observatory/strasbourg observatory, observatory/strasbourg observatory h-alpha planetary nebula Tags conference paper Journal Information Publisher Journal Year Month Volume Number Pages DOI URL Miscellaneous Typesetting Pages Language License Submit Reset