@Unpublished{BdVFK-2019,
	title={Exact Solution of the Donor-Limited Nearest Neighbor Hot Deck Imputation Problem},
	author={{J. Pablo} Burgard and Sven de Vries and Dennis Kreber and Ulf Friedrich},
  url      = {http://www.optimization-online.org/DB_HTML/2019/08/7343.html},
  	year = {2020}
}