J16, J24, O33
D13, I2, J13, J16, J22
Q16, O33, D83, J16, C93
J22, J64, J16
J16, J24, O33, L96, D13, D83
D83, D91, J16, J29, O53, Z12, Z13
C93, J16, O33, K42
(Consumer Economics: Empirical Analysis), Q42 (Alternative Energy Sources)
I14, I15, I31, J16, J13
I21, J16, D91