01062nam--2200313---450099000107765020331620020507132541.0000107765USA01000107765(ALEPH)000107765USA0100010776520020507d1977----km-y0ENGy0103----baengDE<<The>> Deficiency Index Problem for Powers of Ordinary Differential ExpressionsRobert M. Kauffman, Thomas T. Read and Anton ZettlBerlinSpringer verlag1977VI, 112 p.ill.24 cmLecture notes in mathematics6212001Lecture notes in mathematics621KAUFFMAN,Robert M.438332ITsalbcISBD990001077650203316510 LNM 621908551000109714BKSCIALESSANDRA9020020507USA011325PATRY9020040406USA011715Deficiency index problem for powers of ordinary differential expressions262838UNISA