Muller, R.            frey50        <br/><br/>
Nemesis 

 -  Weidenfeld & Nicolso  1988 
<br/><br/><label>ISBN: </label>1-55584-173-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>END OF THE WORLD (ASTRONOMY)<br/>Asteroids<br/>EXTINCTION (BIOLOGY)