Frequency analysis of strongly nonlinear generalized Duffing oscillators using He’s frequency–amplitude formulation and He’s energy balance method D Younesian, H Askari, Z Saadatnia, M KalamiYazdi Computers & Mathematics with Applications 59 (9), 3222-3228, 2010 | 164 | 2010 |

Approximate periodic solutions for the Helmholtz–Duffing equation H Askari, Z Saadatnia, D Younesian, A Yildirim, M Kalami-Yazdi Computers & Mathematics with Applications 62 (10), 3894-3901, 2011 | 55 | 2011 |

Analysis of nonlinear oscillations of a punctual charge in the electric field of a charged ring via a Hamiltonian approach and the energy balance method A Yildirim, H Askari, Z Saadatnia, M KalamiYazdi, Y Khan Computers and Mathematics with Applications 62 (1), 486, 2011 | 48 | 2011 |

Analytical approximate solutions for the generalized nonlinear oscillator D Younesian, H Askari, Z Saadatnia, M KalamiYazdi Taylor & Francis Group, 2011 | 48 | 2011 |

Dynamic Analysis of Vibrating Systems with Nonlinearities MK Yazdi, H Ahmadian, A Mirzabeigy, A Yildirim Communications in Theoretical Physics 57, 183, 2012 | 47 | 2012 |

Analytical solutions for autonomous conservative nonlinear oscillator MK Yazdi, Y Khan, M Madani, H Askari, Z Saadatnia, A Yildirim International Journal of Nonlinear Sciences and Numerical Simulation (ISSN …, 2010 | 45 | 2010 |

Higher order approximate periodic solutions for nonlinear oscillators with the Hamiltonian approach A Yildirim, Z Saadatnia, H Askari, Y Khan, M KalamiYazdi Applied Mathematics Letters, 2011 | 44 | 2011 |

Frequency analysis of nonlinear oscillators with rational restoring force via He’s energy balance method and He’s variational approach H Askari, MK Yazdi, Z Saadatnia Nonlinear Science Letters A 1 (4), 425-430, 2010 | 44 | 2010 |

Analytical approximations to the solutions for a generalized oscillator with strong nonlinear terms L Cveticanin, M Kalami-Yazdi, H Askari Journal of Engineering Mathematics 77 (1), 211-223, 2012 | 40 | 2012 |

Application of Hamiltonian approach to the generalized nonlinear oscillator with fractional power L Cveticanin, M Kalami-Yazdi, Z Saadatnia, H Askari International Journal of Nonlinear Sciences and Numerical Simulation 11 (12 …, 2010 | 39 | 2010 |

A relationship between three analytical approaches to nonlinear problems A Yildirim, H Askari, MK Yazdi, Y Khan Applied Mathematics Letters 25 (11), 1729-1733, 2012 | 34 | 2012 |

Vibration of a two-mass system with non-integer order nonlinear connection L Cveticanin, M KalamiYazdi, H Askari, Z Saadatnia Mechanics Research Communications, 2012 | 31 | 2012 |

Nonlinear vibration analysis of a rigid rod on a circular surface via Hamiltonian approach Y Khan, Q Wu, H Askari, Z Saadatnia, M Kalami-Yazdi Mathematical and Computational Applications 15 (5), 974-977, 2010 | 31 | 2010 |

Dynamic analysis of generalized conservative nonlinear oscillators via frequency amplitude formulation Y Khan, M Kalami-Yazdi, H Askari, Z Saadatnia Arabian Journal for Science and Engineering 38 (1), 175-179, 2013 | 30 | 2013 |

Free vibration analysis of strongly nonlinear generalized duffing oscillators using He’s variational approach & homotopy perturbation method D Younesian, H Askari, Z Saadatnia, M KalamiYazdi Nonlinear Science Letters A 2, 11-16, 2011 | 28 | 2011 |

Application of Higher order Hamiltonian Approach to Nonlinear Vibrating Systems H Askari, ZS Nia, A Yildirim, MK Yazdi, Y Khan Journal of Theoretical and Applied Mechanics 51 (2), 287-296, 2013 | 25 | 2013 |

Periodic solutions for nonlinear oscillation of a centrifugal governor system using the He’s frequency-amplitude formulation and He’s energy balance method D Younesian, H Askari, Z Saadatnia, MK Yazdi Nonlinear Sci Lett A 2 (3), 143-149, 2011 | 21 | 2011 |

Nonlinear oscillators with non-polynomial and discontinuous elastic restoring forces MK Yazdi, A Mirzabeigy, H Abdollahi Nonlinear Science Letters A 3 (1), 48-53, 2012 | 19 | 2012 |

Frequency analysis of nonlinear oscillations via the global error minimization M Kalami Yazdi, P Hosseini Tehrani Nonlinear Engineering 5 (2), 87-92, 2016 | 16 | 2016 |

Analytical approximations for a conservative nonlinear singular oscillator in plasma physics A Mirzabeigy, M Kalami-Yazdi, A Yildirim Journal of the Egyptian Mathematical Society 20 (3), 163-166, 2012 | 14 | 2012 |