@article {layton2002semi,
	title = {A semi-Lagrangian semi-implicit numerical method for models of the urine concentrating mechanism},
	journal = {SIAM Journal on Scientific Computing},
	volume = {23},
	number = {5},
	year = {2002},
	pages = {1526{\textendash}1548},
	publisher = {SIAM},
	author = {Layton, Anita T and Layton, Harold E}
}