000			00377nmm a2200133Ia 4500
008			230125s9999||||xx |||||||||||||||||und||
020			_a9781461517559
100			_aV.A. Il'in
245		0	_aSpectral Theory of Differential Operators
250			_a1995
260			_bSpringer US _c1995
650			_aMathematics and Statistics
856			_uhttps://doi.org/10.1007/978-1-4615-1755-9
999			_c9781 _d9781