TY  - RPRT
TI  - Discussion on mechanics of ripple formation by Dr. H. K. Liu
AU  - M.L. Albertson
AU  - B.V. Richardson
AU  - D.B. Simons
PY  - 1957
DO  - 10.3133/ofr572
UR  - https://pubs.usgs.gov/publication/ofr572
ID  - ofr572
ER  -