@inproceedings{inproceedings74613279,
title   = {Rb/Sr establishes an age of 61 to 67 Ma for Colombian Emeralds},
author = {Romero Ordoñez, Fernando Heli and Kawashita, Koji and Schultz-Güttler, Rainer Aloys},
year = {2001},
publisher = {Sociedad Geologica de Chile},
booktitle   = {South American Symposium on Isotope Geology}
}