This volume contains the papers presented at the 21st Conference on Scientific Services & Internet (SSI-2019)1 held on September 23-28, 2019 in Novorossiysk-Abrau, Russia. SSI has been held annually since 1998 and has been published in CEUR Workshop Proceedings since 20182. SSI-2019 was organized jointly by the Keldysh Institute of Applied Mathematics and Kazan Federal University as the leaders in the field of programming and information processing technologies with organization support by Southern Federal University. The issues discussed at the conference include: national bibliographic systems, Semantic Web, on-line libraries, and information systems for geology, geochemistry, crystallography, physics of a solid body and nuclear physics. All the collected papers have been reviewed by the program committee. The conference was attended by a wide scope of researchers from national and international science centers and was supported by the Russian Foundation for Basic Research, the project #19-07-20059. Last but not least, we are grateful to our program and organizing committees, who made the conference possible.
Preface
Mikhail Gorbunov-Posadov, Dr. Sc., Keldysh Institute of Applied Mathematics,
Moscow Alexandr Elizarov, Dr. Sc., Kazan Federal University Vladimir Voevodin, corresponding member of the RAS, Lomonosov Moscow State
University Mikhail Yakobovskiy, corresponding member of the RAS, Keldysh Institute of Applied Mathematics, Moscow Program Committee
Tatiana Polilova, Dr. Sc., Keldysh Institute of Applied Mathematics, Moscow Organizing Committee iii Mickail German, Keldysh Institute of Applied Mathematics, Moscow Tatiana Sushkevich, Dr.Sc., Keldysh Institute of Applied Mathematics, Moscow Felix Kasparinskiy, Cand. Sc., Lomonosov Moscow State University, Moscow Alexey Kondratenko, GU CB, Rostov Region