000 00297nam a2200097Ia 4500
008 240404s9999 xx 000 0 und d
100 _aLee Keyfitz, Barbara
245 0 _aNonlinear evolution equations that change type
_cBarbara Lee Keyfitz
260 _aNew York
_bSpringer
_c1990
942 _aIMAR
_cCART
999 _c35002
_d35002