Limit cycles of differential equations C Christopher, C Li Springer Science & Business Media, 2007 | 325 | 2007 |

Multiplicity of invariant algebraic curves in polynomial vector fields C Christopher, J Llibre, JV Pereira Pacific J. Math 229 (1), 63-117, 2007 | 248 | 2007 |

Invariant algebraic curves and conditions for a centre CJ Christopher Proceedings of the Royal Society of Edinburgh Section A: Mathematics 124 (6 …, 1994 | 200 | 1994 |

Integrability via invariant algebraic curves for planar polynomial differential systems C Christopher, J Llibre Annals of Differential Equations 16 (1), 5-19, 2000 | 184 | 2000 |

Isochronous centers in planar polynomial systems CJ Christopher, J Devlin SIAM Journal on Mathematical Analysis 28 (1), 162-177, 1997 | 142 | 1997 |

Normalizable, integrable, and linearizable saddle points for complex quadratic systems in C Christopher, P Mardešić, C Rousseau Journal of Dynamical and Control Systems 9 (3), 311-363, 2003 | 119 | 2003 |

Polynomial systems: a lower bound for the Hilbert numbers CJ Christopher, NG Lloyd Proceedings of the Royal Society of London. Series A: Mathematical and …, 1995 | 119 | 1995 |

Algebraic aspects of integrability for polynomial systems C Christopher, J Llibre Qualitative theory of dynamical systems 1, 71-95, 1999 | 115 | 1999 |

Small-amplitude limit cycle bifurcations for Liénard systems with quadratic or cubic damping or restoring forces C Christopher, S Lynch Nonlinearity 12 (4), 1099, 1999 | 115 | 1999 |

Liouvillian first integrals of second order polynomial differential equations C Christopher Southwest Texas State University, Department of Mathematics, 1999 | 110 | 1999 |

Towards a new model of crack tip stress fields CJ Christopher, MN James, EA Patterson, KF Tee International Journal of Fracture 148, 361-371, 2007 | 108 | 2007 |

Estimating limit cycle bifurcations from centers C Christopher Differential equations with symbolic computation, 23-35, 2005 | 108 | 2005 |

Algorithmic derivation of centre conditions JM Pearson, NG Lloyd, CJ Christopher SIAM review 38 (4), 619-636, 1996 | 104 | 1996 |

On the paper of Jin and Wang concerning the conditions for a centre in certain cubic systems CJ Christopher, NG Lloyd Bulletin of the London Mathematical Society 22 (1), 5-12, 1990 | 102 | 1990 |

Darboux integrability and invariant algebraic curves for planar polynomial systems C Christopher, J Llibre Saló, C Pantazi, X Zhang | 89 | 2004 |

Assessment of crack tip plastic zone size and shape and its influence on crack tip shielding JM Vasco‐Olmo, MN James, CJ Christopher, EA Patterson, FA Díaz Fatigue & Fracture of Engineering Materials & Structures 39 (8), 969-981, 2016 | 83 | 2016 |

An algebraic approach to the classification of centers in polynomial Liénard systems C Christopher Journal of mathematical analysis and applications 229 (1), 319-329, 1999 | 83 | 1999 |

Quadratic like cubic systems NG Lloyd, CJ Christopher, J Devlin, JM Pearson, N Yasmin Differential Equations Dynam. Systems 5 (3-4), 329-345, 1997 | 77 | 1997 |

A quantitative evaluation of fatigue crack shielding forces using photoelasticity CJ Christopher, MN James, EA Patterson, KF Tee Engineering Fracture Mechanics 75 (14), 4190-4199, 2008 | 71 | 2008 |

Limit cycles in highly non-linear differential equations S Lynch, CJ Christopher Journal of Sound and Vibration 224 (3), 505-517, 1999 | 68 | 1999 |