TY  - RPRT
TI  - Visually perceived vertical and visually perceived horizontal are not orthogonal.
AU  - G A Betts
AU  - I S Curthoys
PY  - 1998
DO  - 10.1016/s0042-6989(97)00401-x
UR  - https://pubmed.ncbi.nlm.nih.gov/9797945/
ID  - 9797945
ER  -