@article{AIHPD_2019__6_2_155_0,
     author = {Amini, Omid},
     title = {The exchange graph and variations of the ratio of the two {Symanzik} polynomials},
     journal = {Annales de l{\textquoteright}Institut Henri Poincar\'e D},
     pages = {155--197},
     volume = {6},
     number = {2},
     year = {2019},
     doi = {10.4171/aihpd/68},
     mrnumber = {3950652},
     zbl = {1414.05151},
     language = {en},
     url = {http://archive.numdam.org/articles/10.4171/aihpd/68/}
}