@incollection{Collier1996-COLOTN,pages = {1--10},publisher = {Kluwer Academic Publishers},title = {On the Necessity of Natural Kinds},author = {John Collier},editor = {P. Riggs},booktitle = {Natural Kinds, Laws of Nature and Scientific Methodology},abstract = {Natural kinds are central to most might decide to restrict systematisation just to scientific reasoning about the world. For that..},year = {1996}}@