@article{D Hey2013, author = "J D Hey", title = "{Atomic collision data for hydrogen principal quantum numbers n ranging from 1 to 1500, relevant for conditions pertaining to the gaseous nebula W51 [7, 8]: T = 104 K, Ne = Nf = 2500 cm−3}", year = "2013", month = "8", url = "https://iop.figshare.com/articles/dataset/_Atomic_collision_data_for_hydrogen_principal_quantum_numbers_em_n_em_ranging_from_1_to_1500_relevan/1012696", doi = "10.6084/m9.figshare.1012696.v1" }