TY  - RPRT
TI  - Topological four-dimensional self-dual gravity.
AU  - A Nakamichi
AU  - A Sugamoto
AU  - I Oda
PY  - 1991
DO  - 10.1103/physrevd.44.3835
UR  - https://pubmed.ncbi.nlm.nih.gov/10013855/
ID  - 10013855
ER  -