@article {drakopoulos2003choice,
	title = {Choice of theoretical foundations of union utility functions involving discontinuities},
	journal = {SPOUDAI},
	volume = {53},
	number = {3},
	year = {2003},
	pages = {3{\textendash}13},
	publisher = {University of Piraeus},
	author = {Drakopoulos, SA}
}
