TY  - JOUR
AU  - Yin Tian
TI  - A categorification of the square root of $-1$
JO  - Fundamenta Mathematicae
PY  - 2016
SP  - 89
EP  - 98
VL  - 232
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm232-1-7/
DO  - 10.4064/fm232-1-7
LA  - en
ID  - 10_4064_fm232_1_7
ER  -