Correlation and analysis of ultrasonic test results in evaluating reinforced resin laminates : Schultz, A.W. Materials Research and Standards, 7, No 8, pp. 341–345 (August 1967)

Abstract

The existence of infinitely many subharmonic solutions is obtained for a class of nonautonomous second order Hamiltonian systems with a new superquadratic condition. Furthermore, we can get the existence of homoclinic solutions as the limit of subharmonics under a stronger superquadratic condition which is still weaker than the growth conditions in the references.