Sikorshi, Roman <br/><br/>
Boolean algebras / 
Roman Sikorski 
 - 3rd ed. 
 - Berlin :  Springer-Verlag,  1969 
 - 237 p. :  ill. ;  24 cm. 
<br/><br/><label>LCCN: </label>68-059302 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra, Boolean