Landis, E. M. Relationship between the growth of the solution of a parabolic equation and the number of its sign alternations. (Russian) Zbl 0089.07701 Dokl. Akad. Nauk SSSR 123, 787-790 (1958). PDFBibTeX XMLCite \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 123, 787--790 (1958; Zbl 0089.07701)
Landis, E. M. Relationship between the growth of the solution of an elliptical equation and the number of its sign alternations. (Russian) Zbl 0089.07601 Dokl. Akad. Nauk SSSR 123, 602-605 (1958). PDFBibTeX XMLCite \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 123, 602--605 (1958; Zbl 0089.07601)
Landis, E. M.; Petrovskij, I. G. On the numher of limit cycles of equation \({dy \over dx} = {P(x, y) \over Q (x, y)}\), in which \(P\) and \(Q\) are polynomials of degree \(n\). (Russian) Zbl 0079.30704 Dokl. Akad. Nauk SSSR 113, 748-751 (1957). PDFBibTeX XMLCite \textit{E. M. Landis} and \textit{I. G. Petrovskij}, Dokl. Akad. Nauk SSSR 113, 748--751 (1957; Zbl 0079.30704)
Landis, E. M. On some properties of solutions of elliptic equations. (Russian) Zbl 0075.28201 Dokl. Akad. Nauk SSSR 107, 640-643 (1956). PDFBibTeX XMLCite \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 107, 640--643 (1956; Zbl 0075.28201)
Landis, E. M. On the Phragmén-Lindelöf principle for elliptic equations. (Russian) Zbl 0070.32401 Dokl. Akad. Nauk SSSR 107, 508-511 (1956). PDFBibTeX XMLCite \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 107, 508--511 (1956; Zbl 0070.32401)
Landis, E. M. On the set of points with an infinite derivative. (Russian) Zbl 0070.05602 Dokl. Akad. Nauk SSSR 107, 202-204 (1956). PDFBibTeX XMLCite \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 107, 202--204 (1956; Zbl 0070.05602)
Petrovskij, I. G.; Landis, E. M. Über die Anzahl der Grenzzyklen der Gleichung \(dy/dx=M(x,y)/N(x,y)\), wo \(M\) und \(N\) Polynome zweiten Grades sind. (Russian) Zbl 0064.33404 Dokl. Akad. Nauk SSSR 102, 29-32 (1955). PDFBibTeX XMLCite \textit{I. G. Petrovskij} and \textit{E. M. Landis}, Dokl. Akad. Nauk SSSR 102, 29--32 (1955; Zbl 0064.33404)