@article{article, title  = {{Spectral classification of O2-3.5If/WN5-7 stars}},

 url = {{http://eprints.whiterose.ac.uk/123510/ }},

 year = {{2011}},

 month = {{1}},

 author = {{Crowther PA and Walborn NR}},

 doi = {{10.1111/j.1365-2966.2011.19129.x}},

 volume = {{416}},

 journal = {{Monthly Notices of the Royal Astronomical Society}},

 issue = {{2}},

 pages = {{1311-1323}},

 note = {{Accessed on 2024/12/23}}}