References:

1. B.E. Huber, C.A. Richards, "Regulated Expression Of Artificial Chimeric Genes Contained In Retroviral Vectors: Implications For Virus-Directed Enzyme Prodrug Therapy (VDEPT) And Other Gene Therapy Applications.," J. DRUG TARGETS 1996;3(5):349-56.

2. L.D. Hurst, A. Atlan, B.O. Bengtsson. "Genetic conflicts," QUAR. REV. BIOL. 1996 Sep;71(3):317-64.

3. C. Huxley. "Mammalian artificial chromosomes: a new tool for gene therapy," GENE THERAPY, 1994 Jan;1(1):7-12.