Fagiolo (2007)<ref>{{Cite journal | first1= G. |last1= Fagiolo | title = Clustering in complex directed networks | year = 2007 | journal = Physical Review E | volume = 76|issue= 2 Pt 2 |pages= 026107 |doi= 10.1103/PhysRevE.76.026107 |pmid= 17930104 |citeseerx= 10.1.1.262.1006 }}</ref> , Clemente 和Grassi (2018)<ref>{{Cite journal | first1 = G.P. |last1= Clemente |first2= R. |last2= Grassi | title = Directed clustering in weighted networks: A new perspective | year = 2018 | journal = Chaos, Solitons & Fractals | volume = 107 | pages = 26–38 | doi = 10.1016/j.chaos.2017.12.007|arxiv= 1706.07322 |bibcode= 2018CSF...107...26C }}</ref> | Fagiolo (2007)<ref>{{Cite journal | first1= G. |last1= Fagiolo | title = Clustering in complex directed networks | year = 2007 | journal = Physical Review E | volume = 76|issue= 2 Pt 2 |pages= 026107 |doi= 10.1103/PhysRevE.76.026107 |pmid= 17930104 |citeseerx= 10.1.1.262.1006 }}</ref> , Clemente 和Grassi (2018)<ref>{{Cite journal | first1 = G.P. |last1= Clemente |first2= R. |last2= Grassi | title = Directed clustering in weighted networks: A new perspective | year = 2018 | journal = Chaos, Solitons & Fractals | volume = 107 | pages = 26–38 | doi = 10.1016/j.chaos.2017.12.007|arxiv= 1706.07322 |bibcode= 2018CSF...107...26C }}</ref> |