[1] OpenGIS Implementation Specification: Coordinate Transformation Services, Open Geospatial Consortium, Inc., OpenGIS Project Document 01-009, 2001-01-12.

[2] OpenGIS Simple Features Specification For SQL, Revision 1.1, Open Geospatial Consortium, Inc., OpenGIS Project Document 99-049, 1999-05-05.

[3] Joint Committee for Guides in Metrology (JCGM), International Vocabulary of Metrology, Basic and General Concepts and Associated Terms (VIM), III ed., Pavillon de Breteuil : JCGM 200:2008, 1.1

[4] Ambler Thompson and Barry N. Taylor, Guide for the Use of the International System of Units (SI), NIST Special Publication 811 2008 Edition

[5] ROCK CHARACTERIZATION TESTING  MONITORING  ISRM Suggested Methods (E.T. Brown) 1981 Pergamon Press Ltd.

[6] Fundamentals and Applications of Rock Mechanics (DEB DEBASIS,VERMA ABHIRAM KUMAR)