TY - BOOK AU - Mackie,Dustin L. AU - Decker,Douglas K. TI - Group and IPA HMOs SN - 0894433415 PY - 1981/// CY - Rockville, Md. PB - Aspen Systems Corp. KW - Health maintenance organizations KW - United States KW - Legislation N1 - Includes bibliographical references and index ER -