TY - BOOK AU - Gray,Alfred TI - Tubes SN - 0201156768 AV - QC174.26.W28 G73 1990 U1 - 516.3/6 19 PY - 1990/// CY - Redwood City, Calif. PB - Addison-Wesley KW - Weyl's problem KW - Geometry, Differential N1 - Includes bibliographical references (p. 261-274) ER -