TY  - JOUR
AU  - shabanzadeh, mehdi
AU  - peykanei, Gholamreza
AU  - hoseini, seyed safdar
AU  - yazdanei, saeid
TI  - Change from the purchasing price policy to the guaranteed price policy and its effects on cropping pattern in Qazvin plain
JO  - Agricultural Economics Research
VL  - 11
IS  - 1
SP  - 101
EP  - 130
PY  - 2019
DO  - 
ER  -