@inproceedings{CHI-2012-SpindlerMD,
	author        = "Martin Spindler and Marcel Martsch and Raimund Dachselt",
	booktitle     = "{Proceedings of the 30th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/2207676.2208583",
	isbn          = "978-1-4503-1015-4",
	pages         = "1277--1286",
	publisher     = "{ACM}",
	title         = "{Going beyond the surface: studying multi-layer interaction above the tabletop}",
	year          = 2012,
}