Issue Date | Title | **Author(s)** | Publisher |

2015 | Application of the Improved Concavity Method to Sixth Order Boussinesq Equations with Arbitrary High Initial Energy | *Kutev, N.; Dimova, M.; Kolkovska, N.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2019 | Existence of Classical Solutions of Linear Non-Cooperative Elliptic Systems | *Boyadzhiev, G.; Kutev, N.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2015 | Finite Time Blow up of the Solutions to Nonlinear Klein-Gordon Equation with Arbitrary High Positive Initial Energy | *Kutev, N.; Kolkovska, N.; Dimova, M.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2014 | Global Behavior of the Solutions to Sixth Order Boussinesq Equation with Linear Restoring Force | *Kutev, N.; Kolkovska, N.; Dimova, M.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2016 | Global Solvability to Double Dispersion Equation with Bernoulli Type Nonlinearity via One Parametric Family of Potential Wells | *Kutev, N.; Dimova, M.; Kolkovska, N.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2012 | Interior Boundaries for Degenerate Elliptic Equations of Second Order Some Theory and Numerical Observations | *Chobanov, G.; Kutev, N.* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

Jul-2003 | Maximum Principle for Linear Second Order Elliptic Equations in Divergence Form | *Fabricant, A.; Kutev, N.; Rangelov, T.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2018 | Maximum Principle for Weakly Coupled Linear Non-Cooperative Systems | *Boyadzhiev, G.; Kutev, N.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2018 | Necessary and Sufficient Condition for Finite Time Blow up of the Solutions to Sixth Order Double Dispersive Equations | *Kutev, N.; Kolkovska, N.; Dimova, M.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

2003 | On Principle Eigenvalue for Linear Second Order Elliptic Equations in Divergence Form | *Fabricant, A.; Kutev, N.; Rangelov, T.* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

2019 | Orbital Stability of Solitary Waves to Fourth Order Dispersive Equations with Quadratic Nonlinearity | *Kolkovska, N.; Dimova, M.; Kutev, N.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |

Jun-2015 | Revised concavity method and applications to nonlinear dispersive equations | *Kutev, N.; Kolkovska, N.; Dimova, M.* | *Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences* |