TY  - RPRT
TI  - Solutions for apparent ages and U-Pb isotope ratios of young systems without initial secular equilibrium: a computer program in Hewlett-Packard BASIC
AU  - K.R. Ludwig
PY  - 1979
DO  - 10.3133/ofr79722
UR  - https://pubs.usgs.gov/publication/ofr79722
ID  - ofr79722
ER  -