TY  - RPRT
TI  - Preferred orientations in purine stacking.
AU  - G K Helmkamp
AU  - N S Kondo
PY  - 1967
DO  - 10.1016/0005-2787(67)90650-8
UR  - https://pubmed.ncbi.nlm.nih.gov/6053243/
ID  - 6053243
ER  -