Beem, John K.,  1942- <br/><br/>
Doubly timelike surfaces/ 
by John K. Beem and Peter Y. Woo. 
 - Providence, R.I.:  American Mathematical Society,  1969. 
 - 115 p.:  26 cm. 
 - Memoirs of the American Mathematical Society;  no. 92. .
<br/><br/>Bibliography: p. 114-115. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Metric spaces.<br/>Topology.