Kaj's address

	  
	    Kaj Holmberg
	    Department of Mathematics
	    Linköping Institute of Technology
	    SE-581 83 Linköping
	    SWEDEN
	    
	    Phone:  +46 13 282867
	    Email:  kaj.holmberg@liu.se
	    URL:    http://users.mai.liu.se/kajho48/