TY  - RPRT
TI  - Null-strut calculus. I. Kinematics.
AU  - A Kheyfets
AU  - NJ LaFave
AU  - WA Miller
PY  - 1990
DO  - 10.1103/physrevd.41.3628
UR  - https://pubmed.ncbi.nlm.nih.gov/10012307/
ID  - 10012307
ER  -