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

**2012 ** | PREFACE | *Gramchev, Todor* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | On the 3-Wave Equations with Constant Boundary Conditions | *Gerdjikov, V. S.; Grahovski, G. G.* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Existence Theorems for Non-Cooperative Elliptic Systems | *Boyadzhiev, G.* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Best Approximation and Moduli of Smoothness | *Dimova Zapryanova, Teodora* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Canonically Conjugate Variables for the μCH Equation | *Christov, Ognyan* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Hyperbolic Fibrations and PDE | *Dimiev, Stancho* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Hyperbolic Double-Complex Laplace Operator | *N. Apostolova, Lilia* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Problems for P-Monge-Ampere Equations | *Anedda, Claudia; Cadeddu, Lucio; Porru, Giovanni* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Riemann-Hilbert Problems with Canonical Normalization and Families of Commuting Operators | *Gerdjikov, V. S.* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Windowed-Wigner Representations, Interferences and Operators | *Boggiatto, Paolo; Carypis, Evanthia; Oliaro, Alessandro* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | On Modified Method of Simplest Equation for Obtaining Exact Solutions of Nonlinear PDEs: Case of Elliptic Simplest Equation | *K. Vitanov, Nikolay* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | An Invariant Theory of Surfaces in the Four-Dimensional Euclidean or Minkowski Space | *Ganchev, Georgi; Milousheva, Velichka* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Polyharmonic Hardy Spaces on the Klein-Dirac Quadric with Application to Polyharmonic Interpolation and Cubature Formulas | *Kounchev, Ognyan; Render, Hermann* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Operators with Polynomial Coefficients and Generalized Gelfand-Shilov Classes | *Calvo, Daniela; De Donno, Giuseppe; Rodino, Luigi* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Closed Form Solutions of Integrable Nonlinear Evolution Equations | *van der Mee, Cornelis* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | New Hardy-Type Inequalities with Singular Weights | *Fabricant, Alexander; Kutev, Nikolai; Rangelov, Tsviatko* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | On the Holomorphic Extension of Solutions of Elliptic Pseudodifferential Equations | *Cappiello, Marco; Nicola, Fabio* | *Institute of Mathematics and Informatics 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* |

**2012 ** | Curriculum Vitae of Petar R. Popivanov | *Editorial* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |

**2012 ** | Oscillation Properties of Some Functional Fourth Order Ordinary Differential Equations | *Petrova, Zornitza* | *Institute of Mathematics and Informatics Bulgarian Academy of Sciences* |