@book{42241,
	author = {Ortega, Gladys and Aceñolaza, Guillermo F.},
	title = {Proceeding of the 7º International Graptolite Conference & Field Meeting of the Subcommission on Silurian Stratigraphy.},
	publisher = {Insugeo,},
	year = {2003.},
	series = {Serie Correlación Geológica},
	address = {Tucumán :}
}