@TechReport{pearl:20-r501,
  author = 	 "Pearl, J.",
    title = 	 "Causal Casual,, and Curious (2013-2020): A colage in 
                  the art of causal reasoning",
  institution =  "Department of Computer Science, University of California, 
		  Los Angeles",
  address = 	 "CA",
  year = 	 2020,
  number =	 "R-501, {$<$http://ftp.cs.ucla.edu/pub/stat\_ser/r501.pdf$>$}"
}