Articles

• In Memoriam: Rumen Maleev (1943-2019)

  Geno Nikolov

  5-8

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• Разнопосочни спомени за Румен Малеев - приятеля и колегата

  Stanimir Troyanski

  9-13

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• Representation of natural numbers by sum of four squares of almost-prive having a special form

  Zhivko H. Petrov, Tatyana L. Todorova

  15-29

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• Review of continuum mechanics and its history. Part I: Deformation and stress. Conservation laws. Constitutive equations

  Bogdana A. Georgieva

  31-56

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• Review of continuum mechanics and its history. Part II: The mechanics of thermoelastic media. Perfect fluids. Linearly viscous fluids

  Bogdana A. Georgieva

  57-79

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• Univariate polynomials and the contractability of certain sets

  Vladimir Petrov Kostov

  81-105

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• Examples of HNN-extensions with nontrivial quasi-kernels

  Nikolay A. Ivanov

  107-129

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• On the regularity of certain three-row almost Hermitian incidence matrices

  Geno Nikolov, Borislava Petrova

  131-137

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