Footprints of primordial introns on the eukaryotic genome: still no clear traces 
Y. Wolf, F. Kondrashov, E. Koonin, Trends in Genetics 17 (2001) 499–501.

Mendel and mathematics
N.H. Barton, Trends in Genetics 17 (2001) 420–420.

No footprints of primordial introns in a eukaryotic genome
Y. Wolf, F. Kondrashov, E. Koonin, Trends in Genetics 16 (2000) 333–334.