Greenberg Comments On A.I.G.
Maurice R Greenberg says his lawyers will soon sit down with federal and state regulators to discuss investigations surrounding accounting practices at American International Group, from which he was forced to resign as chief executive; says lawyers will present seies of position papers to regulators regarding some of accounting practices that led company to restate $4 billion worth of earnings in late May; defends long-term compensation plans he set up (M)