Imbeddings of three-manifold groups  
González-Acuña, Francisco, 
 - Providence, R.I. :  American Mathematical Society, 
 - viii, 55 p. :  ill. ;  26 cm. 
 - number 474 (first of 4 numbers)."  no. 474 .
<br/><br/> Sep-92 
<br/><br/><label>ISBN: </label>0821825348 (acid-free paper)