Leech, Jonathan. <br/><br/>
Two papers : H-coextensions of monoids and the structure of a band of groups/ 
Jonathan Leech. 
 - Providence, R.I.:  American Mathematical Society,  1975. 
 - vii, 95 p.:  ill.;  26 cm. 
 - Memoirs of the American Mathematical Society;  no. 157. .
<br/><br/>Bibliography: p. 95 
<br/><br/><label>ISBN: </label>0821818570 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Monoids.<br/>Semigroups;<br/>Group extensions (Mathematics)