@inbook {51,
	title = {Dwejra and Maqluba: Emblematic Sinkholes in the Maltese Islands},
	booktitle = {Landscapes and Landforms of the Maltese Islands. World Geomorphological Landscapes},
	year = {2019},
	pages = {129-139},
	publisher = {Springer},
	organization = {Springer},
	address = {Cham},
	author = {Calleja, Ivan and Tonelli, Chiara}
}
