title: Comment on "Spaser action, loss compensation, and stability in plasmonic systems with gain".
authors.affiliation: Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wuestner
authors.forename: Andreas
authors.initials: A
authors.lastname: Pusch
authors.forename: Kosmas L
authors.initials: KL
authors.lastname: Tsakmakidis
authors.forename: Joachim M
authors.initials: JM
authors.lastname: Hamm
authors.forename: Ortwin
authors.initials: O
authors.lastname: Hess