@article {Lippert:1958:1610-1928:337,
title = "Criterion and new method of classification for symmetrical filters with losses",
journal = "Acta Acustica united with Acustica",
parent_itemid = "infobike://dav/aaua",
publishercode ="dav",
year = "1958",
volume = "8",
number = "5",
publication date ="1958-01-01T00:00:00",
pages = "337-341",
itemtype = "ARTICLE",
issn = "1610-1928",
url = "https://www.ingentaconnect.com/content/dav/aaua/1958/00000008/00000005/art00011",
author = "Lippert, W.K.R.",
abstract = "A phase criterion for the characteristic reflection and transmission factors of passive and symmetrical acoustical filters with losses is derived from general energy considerations. The criterion consists of a specific restriction for possible phase differences of those factors, if
the sum of the magnitude values is greater than unity.The phase criterion is represented in a diagram and is shown to be useful for classifying symmetrical filters in a new way.",
}