@misc{misc94b72fd6,
title   = {Rb/Sr establisches 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},
booktitle   = {South American Symposium on Isotope Geology}
}