Article history: Received 18 July 2017 Accepted 5 September 2017 Available online 7 September 2017 Submitted by R. Brualdi MSC: 15A09 15A18 15A63

Article history: Received 19 February 2011 Received in revised form 16 July 2011 Accepted 8 September 2011 Available online 17 September 2011

Article history: Received 17 April 2008 Received in revised form 24 July 2008 Accepted 2 September 2008 Available online 6 September 2008

Article history: Reflectance spectroscopy p Received 4 July 2008 Received in revised form 18 September 2008 Accepted 23 September 2008 Available online 25 October 2008

Article history: Received 15 June 2014 Received in revised form 8 July 2014 Accepted 4 September 2014 Available online 20 September 2014

Article history: Displacement on intracontin Received 4 April 2008 Received in revised form 20 July 2008 Accepted 25 July 2008 Available online 18 September 2008 Editor: C.P. Jaupart

Article history: Received 16 July 2008 Received in revised form 18 July 2009 Accepted 30 September 2009 Available online 12 October 2009 Responsible Editor: A.K. Somani