Elderton, Sir William Palin. <br/><br/>
Systems of frequency curves / 
William Palin Elderton and Norman Lloyd Johnson. 
 - Cambridge :  Cambridge University Press,  1969. 
 - 216 p. :  ill. ;  24 cm. 
<br/><br/> Includes indexes. 
<br/><br/>Includes bibliographical references: p. 202-205. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stochastic processes.<br/>Probabilities.