CHRONIC MYELOGENOUS LEUKEMIA: PROLONGED SURVIVAL WITH SPONTANEOUS DECLINE IN THE FREQUENCY OF PH¹-POSITIVE CELLS AND SUBSEQUENT DEVELOPMENT OF MIXED PH¹-POSITIVE AND PH¹-NEGATIVE BLAST CRISIS = LEUCEMIE MYELOCYTAIRE CHRONIQUE. SURVIE PROLONGEE AVEC DIMINUTION SPONTANEE DE LA FREQUENCE DE CELLULES PH1-POSITIVES ET DEVELOPPEMENT SECONDAIRE D'UNE CRISE BLASTIQUE MIXTE PH1 POSITIVE ET PH1 NEGATIVEAPPELBAUM FR; VESNA NAJFEFD; SINGER JW et al.1983; CANCER; ISSN 0008-543X; USA; DA. 1983; VOL. 51; NO 1; PP. 149-153; ABS. ENG; BIBL. 19 REF.; GRAPH.Article