Scientific sojourns abroad

• Statistics Department, Purdue University (USA) ,1970/71.
  
  
• Department of Statistics and Computer Science, University of Delaware, USA, 1977/78, March 1980.
  
  
• Naval Postgraduate School, USA, August 1982.
  
  
• Bell Communications Research, Morristown, USA, January to March, 1987, September, 1991 to July, 1992.
  
  
• Institute for Mathematics and its Applications --- University of Minnesota, Minneapolis, January 1992.
  
  
• Department of Applied Mathematics, University of Adelaide, Australie, 02--03/1995, 04--05/1998, 02--05/2009, 01/2011 02--03/2013, 05/2015, 05/2018, 06/2019.
  
  
• Departimento di Matematica, Università di Pisa, 02--03/2000, 06/2005, 06/2010, 12/2012, 01 and 09/2013, 01/2015, 01/2016, 01/2017, 02/2018, 01/2020.
  
  
• Department of Mathematical and Computer Sciences, Tokyo Institute of Technology, 09/2001 to 03/2002.
  
  
• Department of Mathematics and Statistics, The University of Melbourne, 07--08/2004, 02/2007, 11/2008 to 01/2009, 01--02/2014, 04/2015, 03--04/2017, 02/2019.
  
  
• Department of Statistical and Actuarial Sciences, The University of Western Ontario, 07/2009.
  
  
• School of Mathematics and Statistics, Central South University , Changsha, China, 09, 2015.