Dear authors, editors, and collaborators,

We would like to inform you of an adjustment to the publication fees for scientific articles in our publishing house. This decision has been made after careful consideration and is driven by the need to ensure the continued sustainability and quality of our scientific publishing activities.

Our current pricing has remained unchanged since 2011. Over the past years, however, the costs associated with the entire publishing process: editing, technical processing, digital dissemination, and infrastructure maintenance have increased significantly.

In particular, we have faced rising expenses in the following areas:
- Software licenses and digital publishing platforms;
- Professional editorial and technical processing services;
- Server infrastructure, digital security, and long-term archiving;
- Ensuring accessibility and compliance with international standards for scientific publishing ethics and open access.

To continue offering high-quality publishing services that meet the evolving needs of the scientific community, an update to our publication fees has become necessary. This adjustment will enable us to invest in improving our processes, adopting modern technologies, and increasing the visibility and impact of the research we publish.

We understand that any financial change requires transparency and justification. Therefore, we are committed to clearly communicating the details of the new pricing policy, namely:

▸ papers of 1-8 printed pages: 360 EUR per paper

▸ papers over 8 printed pages: 45 EUR per page

Thank you for your understanding, trust, and continued support in our shared mission to advance and disseminate scientific knowledge.

Recently published book: Order Relations for the Cryptanalysis of Substitution Ciphers on the Basis of Linguistic Data Structures as an Optimal Strategy by Norman Neukel

In order to analyze the solution behavior of general substitution ciphers for cryptanalysis, for the first time this book utilizes the methods of set optimization. The book investigates how to proceed optimally in a specific case. Linguistic data structures, such as the frequencies of the different letters, bigrams and trigrams, are divided into sets and described by order relations appropriate to the German and English languages. In the context of cryptanalysis this allows new solutions of existing models within the scope of set-valued order relations. This approach leads to an optimal strategy.

We have archived in Portico all of our back issues journals published from 2006 till now which guarantees the long-term access to all of our published papers.

Recently published book: Compensation Payments for Aircraft Noise in an Urban Building Conflict Situation on the Basis of a Set-Valued Conjugate Duality by Norman Neukel

This book investigates compensation payments to property owners for aircraft noise in urban conflict situations in the region surrounding the airport for the first time on the basis of a set-valued conjugate duality. This optimal perturbation approach serves as justification for the realization of variable results. This "dual" socio-economy indicates the action strategy of different interest groups. Linear point sets as a new optimum set varying according to socio-economic properties and a payment function are therefore well substantiated.

We have updated our website with new vision allowing versions for smartphones, tablets, mobile devices. We have followed the principles of simplity, predictability and conservatism for our updated website.

Since December 2014, we joined CrossCheck, a plagiarism detection tool. CrossCheck powered by iThenticate is an initiative between iThenticate and CrossRef, established to help publishers prevent professional plagiarism and other forms of scholarly misconduct. The iThenticate database and software tools, and CrossCheck service offer an effective way to compare documents against the largest comparison database of scientific, technical and medical content.

Our company a member of Publishers International Linking Association (PILA) and CrossRef - official DOI registration agency for scholarly and professional publications. The Digital Object Identifier (DOI) system serves as a persistent, actionable identifier for intellectual property online. Major applications of the DOI system currently include: persistent citations in scholarly materials (journal articles, books, etc.) through CrossRef; scientific data sets, through DataCite, a consortium of leading research libraries, technical information providers, and scientific data centers, etc.

SPARC Europe (Scholarly Publishing and Academic Resources Coalition) is an international alliance of academic libraries, research institutes and open access publishers working to improve the scholarly publishing system. SPARC Europe undertakes a number of activities aimed to support the research community in bringing positive change to scholarly communications.

Our journals are digitally archived in Portico - a leading digital preservation service whose mission is to preserve scholarly literature and to ensure long-term access to electronic archives.