The Bell System Technical Journal > 1939 > 18 > 1 > 218 - 221
Source
Abstract
Identifiers
journal ISSN : | 0005-8580 |
DOI | 10.1002/j.1538-7305.1939.tb00812.x |
The Bell System Technical Journal > 1939 > 18 > 1 > 218 - 221
journal ISSN : | 0005-8580 |
DOI | 10.1002/j.1538-7305.1939.tb00812.x |