00515nam a22001337a 4500003000500000082000800005100002200013245014800035264003700183300003100220650003600251700003700287856005700324NUST  a621  aISLAM ,TAYYAB UL   aTribological Study of Friction in Roller Follower Valve Train Considering Effects of Asperity Interaction and Roller Sliding /cTAYYAB UL ISLAM  aIslamabad: bSMME- NUST. c2019.  a59p. ;bSoft Copy, c30cm.  aMS Mechanical Engineering        aSupervisor : DR RIAZ AHMAD MUFTI  uhttp://10.250.8.41:8080/xmlui/handle/123456789/12473