Langer, R. E. (1960). Boundary problems in differential equations: Proceedings of a Symposium conducted by the Mathematics Research Center at the University of Wisconsin, Madison, April 20-22, 1959. Madison: The University of Winsconsin Press.
Παραπομπή Chicago StyleLanger, Rudolph E. Boundary Problems in Differential Equations: Proceedings of a Symposium Conducted By the Mathematics Research Center At the University of Wisconsin, Madison, April 20-22, 1959. Madison: The University of Winsconsin Press, 1960.
Παραπομπή MLALanger, Rudolph E. Boundary Problems in Differential Equations: Proceedings of a Symposium Conducted By the Mathematics Research Center At the University of Wisconsin, Madison, April 20-22, 1959. Madison: The University of Winsconsin Press, 1960.