@article {MR1932379,
	title = {Convex measures of risk and trading constraints},
	journal = {Finance Stoch.},
	volume = {6},
	number = {4},
	year = {2002},
	pages = {429{\textendash}447},
	issn = {0949-2984},
	doi = {10.1007/s007800200072},
	author = {F{\"o}llmer, Hans and Schied, Alexander}
}
