References list of works (co)authored by Johansson in 2013:
Johansson US, Ekman J, Bowie RCK, Halvarsson P, Ohlson JI, Price TD, Ericson PGP (2013). A complete multilocus species phylogeny of the tits and chickadees (Aves: Paridae). Molecular Phylogenetics and Evolution 69, 852-860.