Levinson, N. (1940). Gap and density theorems. American Mathematical Society.
Dyfyniad Arddull ChicagoLevinson, Norman. Gap and Density Theorems. New York: American Mathematical Society, 1940.
Dyfyniad MLALevinson, Norman. Gap and Density Theorems. American Mathematical Society, 1940.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.