Nonsmooth critical point theory and nonlinear elliptic equations at resonance NC Kourogenis, NS Papageorgiou Journal of the Australian Mathematical Society 69 (2), 245-271, 2000 | 168 | 2000 |

Two nontrivial critical points for nonsmooth functionals via local linking and applications D Kandilakis, NC Kourogenis, NS Papageorgiou Journal of Global Optimization 34, 219-244, 2006 | 55 | 2006 |

Nonlinear elliptic eigenvalue problems with discontinuities S Hu, NC Kourogenis, NS Papageorgiou Journal of mathematical analysis and applications 233 (1), 406-424, 1999 | 28 | 1999 |

Time-disaggregated dividend–price ratio and dividend growth predictability in large equity markets P Asimakopoulos, S Asimakopoulos, N Kourogenis, E Tsiritakis Journal of Financial and Quantitative Analysis 52 (5), 2305-2326, 2017 | 23 | 2017 |

Testing for a unit root under errors with just barely infinite variance N Kourogenis, N Pittis Journal of Time Series Analysis 29 (6), 1066-1087, 2008 | 21 | 2008 |

On the distribution of crop yields: Does the central limit theorem apply? P Koundouri, N Kourogenis American Journal of Agricultural Economics 93 (5), 1341-1357, 2011 | 20 | 2011 |

EXTENSI (O) NS () FN () NSMO)() TH (CRITICAL P () INT THEORY AND APPLICATIONS NC Kourogenis, J Papadrianos, NS Papageorgiou | 20 | 2002 |

Aggregational Gaussianity and barely infinite variance in financial returns A Antypas, P Koundouri, N Kourogenis Journal of Empirical Finance 20, 102-108, 2013 | 15 | 2013 |

Estimation of conditional asset pricing models with integrated variables in the beta specification A Antypas, GM Caporale, N Kourogenis, N Pittis Research in International Business and Finance 52, 101148, 2020 | 14* | 2020 |

Strongly nonlinear second order differential inclusions with generalized boundary conditions NC Kourogenis Journal of mathematical analysis and applications 287 (2), 348-364, 2003 | 14 | 2003 |

A weak nonsmooth Palais-Smale condition and coercivity NC Kourogenis, NS Papageorgiou Rendiconti del Circolo Matematico di Palermo 49, 521-526, 2000 | 12 | 2000 |

Three nontrivial solutions for a quasilinear elliptic differential equation at resonance with discontinuous right hand side NC Kourogenis, NS Papageorgiou Journal of mathematical analysis and applications 238 (2), 477-490, 1999 | 12 | 1999 |

Nonlinear hemivariational inequalities of second order using the method of upper-lower solutions N Kourogenis, N Papageorgiou Proceedings of the American Mathematical Society 131 (8), 2359-2369, 2003 | 11 | 2003 |

Open Access in scientific Information: sustainability model and business plan for the infrastructure and organization of OpenAIRE P Koundouri, N Chatzistamoulou, OG Dávila, A Giannouli, N Kourogenis, ... Journal of Benefit-Cost Analysis 12 (1), 170-198, 2021 | 9 | 2021 |

Existence theorems for elliptic hemivariational inequalities involving the *p*‐LaplacianNC Kourogenis, NS Papageorgiou Abstract and Applied Analysis 7 (5), 259-277, 2002 | 9 | 2002 |

Discontinuous quasilinear elliptic problems at resonance N Kourogenis, N Papageorgiou Colloquium Mathematicum 78 (2), 213-223, 1998 | 9 | 1998 |

Factor Models of Stock Returns: GARCH Errors versus Time‐Varying Betas P Koundouri, N Kourogenis, N Pittis, P Samartzis Journal of Forecasting 35 (5), 445-461, 2016 | 8 | 2016 |

Statistical modeling of stock returns: explanatory or descriptive? A historical survey with some methodological reflections P Koundouri, N Kourogenis, N Pittis Journal of Economic Surveys 30 (1), 149-164, 2016 | 7 | 2016 |

Mixing Conditions, Central Limit Theorems, and Invariance Principles: A Survey of the Literature with Some New Results on Heteroscedastic Sequences N Kourogenis, N Pittis Econometric Reviews 30 (1), 88-108, 2010 | 6 | 2010 |

Cointegration, variance shifts and the limiting distribution of the OLS estimator N Kourogenis, N Pittis Economics Letters 99 (1), 103-106, 2008 | 5 | 2008 |