AUTHOR=van Loon Jack J. W. A. 

TITLE=Some Challenges in Gravity Related Research

JOURNAL=Frontiers in Space Technologies

VOLUME=1

YEAR=2020

URL=https://www.frontiersin.org/journals/space-technologies/articles/10.3389/frspt.2020.00003

DOI=10.3389/frspt.2020.00003

ISSN=2673-5075