Etgen, G. J., & Taylor, W. E. Comparison theorems for fourth order differential equations. Wiley.
Chicago Style (17th ed.) CitationEtgen, Garret J., and Willie E. Taylor. Comparison Theorems for Fourth Order Differential Equations. Wiley.
MLA (9th ed.) CitationEtgen, Garret J., and Willie E. Taylor. Comparison Theorems for Fourth Order Differential Equations. Wiley.
Warning: These citations may not always be 100% accurate.