%0 Journal Article %A Hu, Simone %A Schnetz, Oliver %A Shaw, Jim %A Yeats, Karen %T Further investigations into the graph theory of $\phi^4$-periods and the $c_2$ invariant %J Annales de l’Institut Henri Poincaré D %D 2022 %P 473-524 %V 9 %N 3 %U http://www.numdam.org/articles/10.4171/aihpd/123/ %R 10.4171/aihpd/123 %G en %F AIHPD_2022__9_3_473_0