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2. Instability and non-existence of global solutions to nonlinear wave equations of the form Pun = −Au + F(u);Levine;Trans. Amer. Math. Soc.,1974
3. On the non-existence of global solutions to some abstract Cauchy problems of standard and non-standard types;Levine;Rend. Mat.,1975
4. Nonexistence of general weak solutions to some properly and improperly proved problems of mathematical physics. The method of unbounded Fourier coefficients;Levine;Math. Ann.,1975
5. Blow up theorems for solutions of nonlinear wave equations;Glassey;Math. Z.,1973