TY  - JOUR
TI  - Why Does Stock Market Volatility Change Over Time?
AU  - G. William Schwert
JO  - The Journal of Finance
PY  - 1989
VL  - 44
IS  - 5
DO  - 10.1111/j.1540-6261.1989.tb02647.x
UR  - https://doi.org/10.1111/j.1540-6261.1989.tb02647.x
ER  -