Molkenthin , N , Kutza , H , Tupikina , L , Marwan , N , Donges , J F , Feudel , U , Kurths , J & Donner , R V 2017 , ' Edge anisotropy and the geometric perspective on flow networks ' Chaos , vol. 27 , no. 3 , 035802 . DOI: 10.1063/1.4971785