TY - BOOK AU - Harwit,Martin TI - Astrophysical concepts SN - 0387949437 (New York : acidfree paper) AV - QB461 .H37 1998 U1 - 523.01 21 PY - 1998/// CY - New York PB - Springer KW - Astrophysics N1 - Includes bibliographical references (p. [609]-633) and index ER -