@article {2020ApJ...901..145F,
	title = {The Chemical Structure of Young High-mass Star-forming Clumps. II. Parsec-scale CO Depletion and Deuterium Fraction of HCO$^+$},
	journal = {\apj},
	volume = {901},
	number = {2},
	year = {2020},
	month = {oct},
	pages = {145},
	keywords = {1569, 732, 75, 847, 849, astrochemistry, Astrophysics - Astrophysics of Galaxies, Interstellar medium, Interstellar molecules, Massive stars, star formation},
	doi = {10.3847/1538-4357/abada3},
	author = {Feng, S. and D. Li and Caselli, P. and Du, F. and Y. Lin and ipil{\"a}, O. and Beuther, H. and Sanhueza, Patricio and Tatematsu, K. and Liu, S.~Y. and Q. Zhang and Y. Wang and Hogge, T. and Jimenez-Serra, I. and Lu, X. and T. Liu and Wang, K. and Zhang, Z.~Y. and Zahorecz, S. and G. Li and Liu, H.~B. and J. Yuan}
}
