Precise time-matching in chimpanzee allogrooming does not occur after a short delay Phelps, Steve ; Ng, Wing Lon ; Musolesi, Mirco ; Russell, Yvan I. Abstract Publication: PLoS ONE Pub Date: September 2018 DOI: 10.1371/journal.pone.0201810 Bibcode: 2018PLoSO..1301810P