@misc{1164126, author = {A J Goldman}, title = {Uniqueness of trip-end distribution by a gravity model:}, year = {1967}, month = {1967-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.RPT.9645}, language = {en}, }