• To search more than one articles, type the comma(,) in between article numbers.
• To search serious articles, type the dash(-) in between article numbers.
• To search articles number with the dash(-) symbol, such as 79-1, type the period(.) instead of dash(-).

For example : if you search for 1, 11-13 , 35 ,100.1, search results could give you article 1, 11, 12, 13, 35, 100-1.