Литература

                        www.izovolt.ru
                            www.ru.wikipedia.org/wiki
                            www.estmash.ru
                            www.brainsturbogeneral.narod.ru/book/1/2.html
                            www.l-micro.ru
                            www.referat.yabotanik.ru
                            www.vecherka.su
                            www.vestnad.narod.ru