TY  - JOUR
AU  - Khoshkalam, Muosa
AU  - Mahdavi, Rouhollah
TI  - The relationship between risk Premium varies over time and spot prices: a case study Crude oil futures market
JO  - Financial Knowledge of Securities Analysis
VL  - 12
IS  - 43
SP  - 193
EP  - 206
PY  - 1970
DO  - 
ER  -