Nikolai  Salov, Maxim  Dli, Tatyana  Kakatunova, Dmitrii  Tukaev, 
    An Economic and Mathematical Model of IT Service Provider Selection on the
Basis of Analysis of Non-Structured Text Documents,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 5,
    2019,
    Pages 1662-1667,
    ISSN 1816-949x,
    jeasci.2019.1662.1667,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.1662.1667)
    Abstract: The study proposes an economic and mathematical IT service provider selection model requiring no
preliminary intellectual processing of inputs in contrast to known models. In addition, this approach is
characterized by lower computational complexity in contrast to known topic modeling-based recommendation
algorithms and enables taking into account the similarity of various topics.
    Keywords: IT outsourcing;analysis of non-structured text documents;text document clustering;recommendation systems;topic modeling;additive regularization of topic models