=> 0: HSDN NTP серверы
   also in: [Links/Russian]
=> 1: IETF's leap seconds database
=> 2: MSK-IX NTP-server
    2001:6d0:ffd4::1
    194.190.168.1
   also in: [Links/Russian]
=> 3: Network Time Protocol Best Current Practices
=> 4: time-nuts
    Discussion of precise time and frequency measurement
   also in: [Links/Maillist]
=> 5: ФГУП "ВНИИФТРИ"
    ntp1.vniiftri.ru
    ntp2.vniiftri.ru
    ntp3.vniiftri.ru
    ntp4.vniiftri.ru
   also in: [Links/Russian]