The reciprocity was analyzed in some real social networks by Gallos.<ref name="GallosRybski2012">{{cite journal|author=Gallos, Lazaros K.|author2=Rybski, Diego|author3=[[Fredrik Liljeros]]|author4=[[Shlomo Havlin]]|author5=Makse, Hernán A.|title=How People Interact in Evolving Online Affiliation Networks|journal=Physical Review X|volume=2|issue=3|year=2012|page=031014|issn=2160-3308|oclc=969762960|doi=10.1103/PhysRevX.2.031014|arxiv=1111.5534|s2cid=16905579}}</ref> | The reciprocity was analyzed in some real social networks by Gallos.<ref name="GallosRybski2012">{{cite journal|author=Gallos, Lazaros K.|author2=Rybski, Diego|author3=[[Fredrik Liljeros]]|author4=[[Shlomo Havlin]]|author5=Makse, Hernán A.|title=How People Interact in Evolving Online Affiliation Networks|journal=Physical Review X|volume=2|issue=3|year=2012|page=031014|issn=2160-3308|oclc=969762960|doi=10.1103/PhysRevX.2.031014|arxiv=1111.5534|s2cid=16905579}}</ref> |