Mathematical Notes
Mathematical Notes > 2003 > 74 > 5-6 > 676-684
Mathematical Notes > 2003 > 74 > 5-6 > 864-873
Mathematical Notes > 2003 > 74 > 5-6 > 853-863
Mathematical Notes > 2003 > 74 > 5-6 > 794-802
Mathematical Notes > 2003 > 74 > 5-6 > 819-828