OSCE chairman's special representative for the Nagorno Karabakh conflict, Swedish parliament deputy Goran Lenmarker will arrive in Yerevan February 4. In his words, the visit aims at a more detailed investigation of the Nagorno Karabakh conflict, collection of facts as well as its causes and condition. G. Lenmarker is to arrive to Yerevan from Baku, where he met today with Azerbaijani parliament chairman Murtuz Aleskerov, RIA Novosti reports.