add reference to Archard_1957
Summary: added reference in paper.bibtex and cited in paper.md
Test Plan: compile paper.md and check this citation
Reviewers: frerot
Reviewed By: frerot
Differential Revision: https://c4science.ch/D249
frerot | Jun 24 2020, 17:38 |
frerot | Jun 24 2020, 17:40 |