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https://www.aanda.org/articles/aa/abs/2003/17/aa3244/aa3244.html
Spectroscopic observations of two proto planetary-nebulae candidates: SS73 56 & Hen 2-79 |...
proto planetary nebulae
https://www.aanda.org/articles/aa/abs/2010/12/aa15585-10/aa15585-10.html
Photodissociation in proto-planetary nebulae - Hydrodynamical simulations and solutions for...
proto planetary nebulae
photodissociation
hydrodynamical
simulations
solutions
https://www.aanda.org/articles/aa/ref/2004/31/aa0461-04/aa0461-04.html
Polarimetric observations of OH masers in proto-planetary nebulae | Astronomy & Astrophysics (A&A)
proto planetary nebulae
oh masers