On bone quality and implant stability measurements.
Friberg B.
PhD thesis, University of Gothenburg, Sweden, 1999.

On implant integration in membrane-induced and grafted bone.
Rasmusson L.
PhD thesis. University of Gothenburg, Sweden. 1998. 

On the clinical measurement of implant stability and osseointegration. 
Meredith N.
PhD thesis, University of Gothenburg, Sweden, 1997.