TY  - JOUR
TI  - Conditional Heteroskedasticity in Asset Returns: A New Approach
AU  - Daniel B. Nelson
JO  - Econometrica
PY  - 1991
VL  - 59
IS  - 2
DO  - 10.2307/2938260
UR  - https://doi.org/10.2307/2938260
ER  -