@article{243246, author = {Neil Ashby and Thomas Parker and Bijunath Patla}, title = {A null test of General Relativity: Long term comparison of H-masers and Cs-fountains}, year = {2018}, month = {2018-08-01}, publisher = {Science Magazine}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923529}, language = {en}, }