International Mathematics Research Notices, 2017.
(with Kathlén Kohn and Bernt Ivar Utstøl Nødland)
to appear in Combinatorial Algebraic Geometry, editors G. Smith and B. Sturmfels.
(with Carlos Améndola, Kathlén Kohn, Sara Lamboglia, Diane Maclagan, Ben Smith, Jeff Sommars and Magdalena Zajaczkowska)