@article { schde kir2013, author = "Schiavon, N and De Caro, Tilde and Kiros, A and Caldeira, A Teresa and Parisi, I and Riccucci, C and Gigante, Giovanni", title = "A multianalytical approach to investigate stone biodeterioration at a UNESCO world heritage site: the volcanic rock-hewn churches of Lalibela, Northern Ethiopia.", year = "2013" }