Masahito Hasegawa Martin Hofmann Gordon D. Plotkin Finite Dimensional Vector Spaces Are Complete for Traced Symmetric Monoidal Categories. 367-385 2008 conf/birthday/2008trakhtenbrot Pillars of Computer Science http://dx.doi.org/10.1007/978-3-540-78127-1_20 db/conf/birthday/trakhtenbrot2008.html#HasegawaHP08