[1] BARRETT J. H.:
Oscillation theory of ordinary linear differential equations. Advances in Mathematics, 3 (1969), 415-509.
MR 0257462 |
Zbl 0213.10801
[2] HANAN M.:
Oscillation criteria for third-order linear differential equations. Pacific J. Math. 11 (1961), 919-944.
MR 0145160 |
Zbl 0104.30901
[3] SANSONE O.:
Studi sulle equasioni differenziali lineari omogeneedi terso ordine nel campo reale. Revista Mat. Fis. Teor. Tucuman 6 (1948), 195-253.
MR 0027404
[4] ŠVEC M.:
Neskolko zamečanij o linejnom differencionalnom uravneniji tretjego porjadka. Czech. Math. J. 15 (1965), 42-49.
MR 0171970
[5] SWANSON C. A.:
Comparison and oscillation theory of linear differential equations. Acad. Press, vol. 48, New York & London 1968.
MR 0463570 |
Zbl 0191.09904