ISLAMABAD, February 19: The National Accountability Bureau (NAB) has decided to file a corruption reference against former petroleum minister Dr Asim Hussain who is a close aide of former president Asif Ali Zardari. The decision was made in a meeting of NAB Executive Board here Friday. According to the statement issued here, Dr Asim is accused of illegal allotment of land besides unjust distribution of natural gas and money laundering.-DNA