Berkovits, Juha Local bifurcation results for systems of semilinear equations. (English) Zbl 0877.58017 J. Differ. Equations 133, No. 2, 245-254 (1997). Reviewer: V.Moroz (Minsk) MSC: 58E07 47J10 35L70 55M25 47H11 × Cite Format Result Cite Review PDF Full Text: DOI
Berkovits, Juha; Mustonen, Vesa On the existence of multiple solutions for semilinear equations with monotone nonlinearities crossing a finite number of eigenvalues. (English) Zbl 0757.35002 Nonlinear Anal., Theory Methods Appl. 17, No. 5, 399-412 (1991). Reviewer: L.Vazquez (Madrid) MSC: 35B10 35L70 35L05 35B45 35A99 47H11 55M25 × Cite Format Result Cite Review PDF Full Text: DOI
Berkovits, Juha; Mustonen, Vesa On multiple solutions for a class of semilinear wave equations. (English) Zbl 0729.35081 Nonlinear Anal., Theory Methods Appl. 16, No. 5, 421-434 (1991). Reviewer: A.Jeffrey (Newcastle upon Tyne) MSC: 35L70 55M25 × Cite Format Result Cite Review PDF Full Text: DOI
Berkovits, Juha; Mustonen, Vesa An application of the topological degree theory for semilinear equations with strongly monotone nonlinearities. (English) Zbl 0762.35080 Bull. Lond. Math. Soc. 23, No. 5, 470-476 (1991). Reviewer: H.-D.Alber (Darmstadt) MSC: 35P30 55M25 47J05 47A75 × Cite Format Result Cite Review PDF Full Text: DOI
Berkovits, Juha; Mustonen, Vesa An extension of Leray-Schauder degree and applications to nonlinear wave equations. (English) Zbl 0724.47024 Differ. Integral Equ. 3, No. 5, 945-963 (1990). Reviewer: J.Appell (Würzburg) MSC: 47H05 47J05 35L05 35L70 55M25 × Cite Format Result Cite Review PDF
Berkovits, Juha; Mustonen, Vesa On the topological degree for mappings of monotone type. (English) Zbl 0605.47060 Nonlinear Anal., Theory Methods Appl. 10, 1373-1383 (1986). Reviewer: J.Appell MSC: 47J05 47H05 35J65 55M25 × Cite Format Result Cite Review PDF Full Text: DOI
Berkovits, Juha On the degree theory for nonlinear mappings of monotone type. (English) Zbl 0592.55003 Ann. Acad. Sci. Fenn., Ser. A I, Diss. 58, 58 p. (1986). Reviewer: Ch.Fenske MSC: 55M25 47H05 × Cite Format Result Cite Review PDF