@book{7007,
	author = {Pogorelov, A. V. and Kra, Irwin.},
	title = {Hilbert's fourth problem /},
	publisher = {V. H. Winston ;},
	year = {1979.},
	address = {Washington :},
	note = {Translation of Chetvertai︠a︡ problema Gilʹberta.}
}