HILLE-WINTNER TYPE COMPARISON THEOREMS FOR SECOND-ORDER ORDINARY DIFFERENTIAL EQUATIONSBUTLER GJ.1979; PROC. AMER. MATH. SOC.; USA; DA. 1979; VOL. 76; NO 1; PP. 51-59; BIBL. 12 REF.Article

A NOTE ON NONOSCILLATORY SOLUTIONS OF A SUBLINEAR HILL'S EQUATION.BUTLER GJ.1978; J. MATH. ANAL. APPL.; U.S.A.; DA. 1978; VOL. 63; NO 1; PP. 43-49; BIBL. 8 REF.Article

THE EXISTENCE OF CONTINUABLE SOLUTIONS OF A SECOND ORDER DIFFERENTIEL EQUATION.BUTLER GJ.1977; CANAD. J. MATH.; CANADA; DA. 1977; VOL. 29; NO 3; PP. 472-479; BIBL. 6 REF.Article

THE OSCILLATORY BEHAVIOR OF A SECOND ORDER NONLINEAR DIFFERENTIAL EQUATION WITH DAMPING.BUTLER GJ.1977; J. MATH. ANAL. APPL.; U.S.A.; DA. 1977; VOL. 57; NO 2; PP. 273-289; BIBL. 11 REF.Article

OSCILLATION THEOREMS FOR A NON-LINEAR ANALOGUE OF HILL'S EQUATION.BUTLER GJ.1976; QUART. J. MATH.; G.B.; DA. 1976; VOL. 27; NO 106; PP. 159-171; BIBL. 15 REF.Article

PERIODIC SOLUTIONS OF SUBLINEAR SECOND ORDER DIFFERENTIAL EQUATIONS.BUTLER GJ.1978; J. MATH. ANAL. APPL.; U.S.A.; DA. 1978; VOL. 62; NO 3; PP. 676-690; BIBL. 7 REF.Article

ON THE OSCILLATORY BEHAVIOUR OF A SECOND ORDER NONLINEAR DIFFERENTIAL EQUATION.BUTLER GJ.1975; ANN. MAT. PURA APPL.; ITAL.; DA. 1975; VOL. 105; PP. 73-92; BIBL. 17 REF.Article

INTEGRAL AVERAGES AND THE OSCILLATION OF SECOND ORDER ORDINARY DIFFERENTIAL EQUATIONSBUTLER GJ.1980; S.I.A.M. J. MATH. ANAL.; USA; DA. 1980; VOL. 11; NO 1; PP. 190-200; BIBL. 21 REF.Article

RAPID OSCILLATION, NONEXTENDABILITY, AND THE EXISTENCE OF PERIODIC SOLUTIONS TO SECOND ORDER NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS.BUTLER GJ.1976; J. DIFFER. EQUATIONS; U.S.A.; DA. 1976; VOL. 22; NO 2; PP. 467-477; BIBL. 9 REF.Article

THE EXISTENCE OF PERIODIC SOLUTIONS OF AN AUTONOMOUS SECOND ORDER NON-LINEAR DIFFERENTIAL EQUATION.BUTLER GJ.1974; ANN. POLON. MATH.; POLOGNE; DA. 1974; VOL. 30; NO 2; PP. 165-174; BIBL. 11 REF.Article

INTEGRAL COMPARISON THEOREMS AND EXTREMAL POINTS FOR LINEAR DIFFERENTIAL EQUATIONSBUTLER GJ; ERBE LH.1983; JOURNAL OF DIFFERENTIAL EQUATIONS; ISSN 0022-0396; USA; DA. 1983; VOL. 47; NO 2; PP. 214-226; BIBL. 10 REF.Article

NONLINEAR INTEGRAL RICCATI SYSTEMS AND COMPARISON THEOREMS FOR LINEAR DIFFERENTIAL EQUATIONSBUTLER GJ; ERBE LH.1983; SIAM JOURNAL ON MATHEMATICAL ANALYSIS; ISSN 0036-1410; USA; DA. 1983; VOL. 14; NO 3; PP. 463-473; BIBL. 11 REF.Article

PERIODIC SOLUTIONS OF A PREDATOR-PREY SYSTEM WITH PERIODIC COEFFICIENTSBUTLER GJ; FREEDMAN HI.1981; MATH. BIOSCI.; ISSN 0025-5564; USA; DA. 1981; VOL. 55; NO 1-2; PP. 27-38; BIBL. 16 REF.Article

BIFURCATION FROM A LIMIT CYCLE IN A TWO PREDATOR-ONE PREY ECOSYSTEM MODELED ON A CHEMOSTATBUTLER GJ; WALTMAN P.1981; J. MATH. BIOL.; ISSN 0303-6812; DEU; DA. 1981; VOL. 12; NO 3; PP. 295-310; BIBL. 15 REF.Article

PERIODIC SOLUTIONS OF X''+F(MU , X)=0BUTLER GJ; FREEDMAN HI.1979; ANN. POLON. MATH; POL; DA. 1979; VOL. 36; NO 1; PP. 29-41; BIBL. 7 REF.Article

AIR COMBAT MANEUVERING TRAINING IN A SIMULATOR.MESHIER CW; BUTLER GJ.1976; A.G.A.R.D. CONF. PROC.; FR.; DA. 1976; NO 198; PP. 23.1-23.10; BIBL. 2 REF.; (FLIGHT SIMULATION-GUIDANCE SYST. SIMULATION. JT. FLIGHT MECH. PANEL-GUIDANCE CONTROL PANEL SYMP.; THE HAGUE; 1975)Conference Paper

PERIODIC SOLUTIONS OF X''+G(X)+MU H(X)=0.BUTLER GJ; FREEDMAN HI.1974; TRANS. AMER. MATH. SOC.; U.S.A.; DA. 1974; VOL. 197; NO 470; PP. 59-74; BIBL. 16 REF.Article

NECROTIZING ENTEROCOLITIS AFTER RENOGRAFIN-76 TREATMENT OF MECONIUM ILEUSGRANTMYRE EB; BUTLER GJ; GILLIS DA et al.1981; AM. J. ROENTGENOL.; ISSN 0092-5381; USA; DA. 1981; VOL. 136; NO 5; PP. 990-991; BIBL. 8 REF.Article

COEXISTENCE OF COMPETING PREDATORS IN A CHEMOSTATBUTLER GJ; HSU SB; WALTMAN P et al.1983; JOURNAL OF MATHEMATICAL BIOLOGY; ISSN 0303-6812; DEU; DA. 1983; VOL. 17; NO 2; PP. 133-151; BIBL. 27 REF.Article

GLOBAL DYNAMICS OF A SELECTION MODEL FOR THE GROWTH OF A POPULATION WITH GENOTYPIC FERTILITY DIFFERENCESBUTLER GJ; FREEDMAN HI; WALTMAN P et al.1982; J. MATH. BIOL.; ISSN 0303-6812; DEU; DA. 1982; VOL. 14; NO 1; PP. 25-35; BIBL. 6 REF.Article