TY  - JOUR
A1  - Griffith, D.A.
A1  - Fischer, M.M.
T1  - Constrained variants of the gravity model and spatial dependence: Model specification and estimation issues
Y1  - 2013
DO  - 10.1007/s10109-013-0182-7
UR  - https://doi.org/doi:10.1007/s10109-013-0182-7
VL  - 15
IS  - 3

ER  -