Bathinda: After a law professor of London got access to 160 Bhagat Singh case files at Lahore in Pakistan for his book, the demand has been raised from Punjab to see those papers of historical importance. Former Jawaharlal Nehru University professor Chaman Lal, who is honorary adviser to Delhi’s Bhagat Singh Archives and Resource Centre, has written to Punjab chief minister Captain Amarinder Singh and state finance minister Manpreet Singh Badal, requesting them to take up the matter with their Pakistani Punjab counterparts. Lal claims that the Punjab Archives in Lahore’s Anarkali Tomb has many files relating to the court cases of Bhagat Singh and its numbers were mentioned from page 135 to 165 in the London professor’s book.