Control theory of hyperbolic equations related to certain questions in harmonic analysis and spectral theory

Linear Operators. Part I: General Theory.

Paul Civin, Nelson Dunford, J. T. Schwartz · American Mathematical Monthly · 1960 · 2.8K citations

Natural Sciences, Mathematics, Algebra +11

Methods of Mathematical Physics, vol. II. Partial Differential Equations

Courant, Hilbert · Journal of Applied Mechanics · 1963 · 605 citations · Full text

Natural Sciences, Mathematics, Physics +14

Boundary value and expansion problems of ordinary linear differential equations

George D. Birkhoff · Transactions of the American Mathematical Society · 1908 · 284 citations

Natural Sciences, Mathematics, Differential Equations +11

Nonharmonic Fourier series in the control theory of distributed parameter systems

David L. Russell · Journal of Mathematical Analysis and Applications · 1967 · 211 citations

Natural Sciences, Mathematics, Systems Engineering +16

Fourier transforms in the complex domain

1964 · 167 citations

Natural Sciences, Electrical Engineering, Physics +10