% pubman genre = article
@article{item_1555031,
title = {{Geochemical Provenance of Obsidian Artifacts from the MSA site of Porc Epic, Ethiopia}},
author = {Negash, Agazi and Shackley, M. S.},
language = {eng},
year = {2006},
date = {2006},
journal = {{Archaeometry}},
volume = {48},
number = {1},
pages = {1--12},
}