No Fault Found events in maintenance engineering Part 2: Root causes, technical developments and future research. - Samir Khan; Paul Phillips; Chris Hockley; Ian Jennions (Reliab. Eng. Syst. Saf., 2014)

No Fault Found events in maintenance engineering Part 1: Current trends, implications and organizational practices. - Samir Khan; Paul Phillips; Ian Jennions; Chris Hockley (Reliab. Eng. Syst. Saf., 2014)