Güsten, Rolf Max Planck Institute for Radio Astronomy, Max Planck Society;
Menten, Karl M. Max Planck Institute for Radio Astronomy, Max Planck Society;
Wiesemeyer, Helmut Max Planck Institute for Radio Astronomy, Max Planck Society;
Neufeld, D. A., Godard, B., Bryan Changala, P., Faure, A., Geballe, T., Güsten, R., et al. (2021). Observations and Analysis of CH+ Vibrational Emissions from the Young, Carbon-rich Planetary Nebula NGC 7027: A Textbook Example of Chemical Pumping. \apj, 917(1): 15, pp. 15. doi:10.3847/1538-4357/ac05c9.