| Issue Date | Title | Author(s) | Publisher |
| 2007 | On the Quality of Decision Functions in Pattern Recognition | Berikov, Vladimir | Institute of Information Theories and Applications FOI ITHEA |
| 2010 | On the Quotient Function Employed in the Blind Source Separation Problem | Fujita, K. | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 2006 | On the Range and the Kernel of Derivations | Bouali, Said; Bouhafsi, Youssef | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 2004 | On the Range of the Fourier Transform Associated with the Spherical Mean Operator | Jelassi, M.; Rachdi, L. | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 1983 | On the Rates of Convergence of Two Moduli of Functions | Ivanov, Kamen G. | Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences |
| 1972 | On the realization of time optimal linear control | Gičev, Todor | Bulgarian Academy of Sciences |
| 2008 | On the Recursive Estimation of the Location and of the Size of the Mode of a Probability Density | Djeddour, Khédidja; Mokkadem, Abdelkader; Pelletier, Mariane | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 2014 | On the Regularity Properties of the Pressure Field Associated to a Hopf Weak Solution to the Navier-Stokes Equations | Mauro, Jimmy Alfonso | Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences |
| 2003 | On the Relationship between Quantified Reflective Logic and Quantified Default Logic | Brown, Frank | Institute of Information Theories and Applications FOI ITHEA |
| 2004 | On the Relationships Among Quantified Autoepistemic Logic, its Kernel, and Quantified Reflective Logic | Brown, Frank | Institute of Information Theories and Applications FOI ITHEA |
| 1970 | On the relative equilibrium of a satellite with rotors | Ančev, Atanas | Bulgarian Academy of Sciences |
| 2015 | On the Remainders Obtained in Finding the Greatest Common Divisor of Two Polynomials | Akritas, Alkiviadis; Malaschonok, Gennadi; Vigklas, Panagiotis | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 1974 | On the representation of linear operators continuously operating in spaces of analytic functions and commuting with the differentiation operator | Korobeynik, Yuri | Bulgarian Academy of Sciences |
| 1972 | On the residual spectrum of a singular integral operator | Denčev, Račo | Bulgarian Academy of Sciences |
| 2006 | On the Residuum of Concave Univalent Functions | Wirths, K.-J. | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 2005 | On the Riemann-Liouville Fractional q-Integral Operator Involving a Basic Analogue of Fox H-Function | Kalla, S.; Yadav, R.; Purohit, S. | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
| 1987 | On the Sectional Curvature of Kähler Manifolds of Indefinite Metrics | Kassabov, Ognian; Borisov, Adrijan | Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences |
| 1973 | On the secular terms of a class of solutions of an autonomic system of differential equations in case of polynomial non-linearities of second degree | Meent, Maung Taung | Bulgarian Academy of Sciences |
| 2011 | On the Semigroup of all Increasing Full Transformations | Dimitrova, Ilinka | Union of Bulgarian Mathematicians |
| 1999 | On the sense preserving mappings in the Helm topology in the plane | Pyrih, Pavel | Institute of Mathematics and Informatics Bulgarian Academy of Sciences |
