The matching extension problem in general graphs is co-NP-complete
Journal of Combinatorial Optimization 35 (2018), no. 3, 853--859.
BibTex references
@Article\{HK18,
author = "Hackfeld, Jan and Koster, Arie M.C.A.",
title = "The matching extension problem in general graphs is co-NP-complete",
journal = "Journal of Combinatorial Optimization",
number = "3",
volume = "35",
pages = "853--859",
year = "2018",
note = "http://dx.doi.org/10.1007/s10878-017-0226-x",
}