CHINESE JOURNAL OF APPLIED PROBABILITY AND STATISTICS     2013 29 (4):  381-391    ISSN: 1001-4268:  CN: 31-1256 / O1 The Additive Hazards Model for Multiple Type Recurrent Gap Times Liu Jicai, Zhang Riquan, Liu Huanbin School of Finance and Statistics, East China Normal University; Department of Mathematics, Shanxi Datong University; College of Mathematics and Computer Science, Huanggang Normal University Received null  Revised null  Online 2013-08-30 Reference   Corresponding author: Liu Jicai