@article {MR3668157,
	title = {A state-constrained differential game arising in optimal portfolio liquidation},
	journal = {Math. Finance},
	volume = {27},
	number = {3},
	year = {2017},
	pages = {779{\textendash}802},
	issn = {0960-1627},
	author = {Schied, Alexander and Zhang, Tao}
}
