@article {24799,
	title = {Preconditioners for saddle point systems with trace constraints coupling 2D and 1D domains},
	journal = {SIAM Journal of Scientific Computing},
	volume = {38},
	year = {2016},
	publisher = {SIAM},
	author = {Kuchta, Miroslav and Nordaas, Magne and Joris C. G. {Verschaeve} and Mortensen, Mikael and Mardal, Kent-Andre}
}
