These publications are available

Smit, J. (1980). "Reply to "Terminal Cretaceous catastrophe"." Nature 287: 760. (pdf)

Smit, J. and J. Hertogen (1980). "An extraterrestrial event at the Cretaceous-Tertiary boundary." Nature 285: 198-200. (pdf)

Smit, J. and J. Hertogen (1980). "Terminal Cretaceous catastrophe." Nature 287: 760. (pdf)

Smit, J. and G. Klaver (1981). "Sanidine spherules at the Cretaceous-Tertiary boundary indicate a large impact event." Nature 292: 47-49. (pdf)

S. J. Batenburg, M. Sprovieri, A. S. Gale, F. J. Hilgen, S. Hüsing, J. Laskar, D. Liebrand, F. Lirer, X.r Orue-Etxebarria, N. Pelosi, J. Smit. (2012) Cyclostratigraphy and astronomical tuning of the Maastrichtian at Zumaia (Basque country, Northern Spain). EPSL 359-360:264-278 (pdf)

 

 
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