E. Angriman, A. van der Grinten, and H. Meyerhenke. {L}ocal {S}earch for {G}roup {C}loseness {M}aximization on {B}ig {G}raphs. 2019 IEEE International Conference on Big Data (Big Data), Los Angeles, CA, USA, December 9-12, 2019, IEEE, 2019.