Spencer-Brown, G. <br/><br/>
Laws of form / 
G. Spencer Brown. 
 - London :  Allen & Unwin,  c1969. 
 - xx, 142 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0045100284 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Philosophy.
<br/><br/><label>Dewey Class. No.: </label>511.3  / BRL 1969