mˈoːɹ pɹˈɑːpɚɾiz ʌv əbzˈɜːvəbəl sˈɪstəmz kæn biː fˈaʊnd ˈɪn, æz wˈɛl æz ðə pɹˈuːf fɚðɪ ˈʌðɚɹ ɪkwˈɪvələnt stˈeɪtmənts ʌv "ðə pˈɛɹ ɪz əbzˈɜːvəbəl" pɹɪzˈɛntᵻd ɪn sˈɛkʃən əbzˌɜːvəbˈɪlᵻɾi ɪn ˌɛltˌiːˈaɪ sˈɪstəmz.
More properties of observable systems can be found in, as well as the proof for the other equivalent statements of "The pair  is observable" presented in section Observability in LTI Systems.