000 00343nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a818519825X
082 _a511
082 _b64 INV
100 _a"Helson,Henry"
245 0 _aInvariant Subspaces And
260 _aNew Delhi
260 _bNarosa
260 _c1990
300 _a"x,165"
999 _c32340
_d32340