Connor, Russell (February 22, 1993). "Back in the Saddle". The New Yorker. p. 147.[1]
nytimes.com
nytimes.com
Carol Vogel (October 24, 1997). "Inside Art". The New York Times.
query.nytimes.com
See "Further Battles for the 'Lisowczyk' (Polish Rider) by Rembrandt" Zdzislaw Zygulski, Jr., Artibus et Historiae, Vol. 21, No. 41 (2000), pp. 197–205. Also New York Times story. There is a book on the subject:Responses to Rembrandt; Who painted the Polish Rider? by Anthony Bailey (New York, 1993)