CAD Problem Solving and Technical Systems Modelling Using the AI Programming Environments. - Ahto Kalja; Vahur Kotkas; Tiit Tiidemann (EJC, 2000)

Public e-Service Projects in Estonia. - Ahto Kalja; Uuno Vallner (BalticDB&IS, 2002)

Applying User Profile Ontology for Mining Web Site Adaptation Recommendations. - Tarmo Robal; Ahto Kalja (ADBIS Research Communications, 2007)

Making Web Users' Domain Models Explicit by Applying Ontologies. - Tarmo Robal; Hele-Mai Haav; Ahto Kalja (ER Workshops, 2007)

A Model for Users' Action Prediction Based on Locality Profiles. - Tarmo Robal; Ahto Kalja (ISD (1), 2007)

Applying e-Environments in Teaching the Basics of Digital Logic. - Tarmo Robal; Ahto Kalja (MSE, 2007)

Ensuring Large-Scale Semantic Interoperability: The Estonian Public Sector's Case Study. - Hele-Mai Haav; Ahto Kalja; Peep Küngas; Martin Luts (DB&IS, 2008)

Web Systems Evaluation on Users' Behaviour Modelling. - Tarmo Robal; Ahto Kalja (DB&IS, 2008)

Conceptual Web Users' Actions Prediction for Ontology-Based Browsing Recommendations. - Tarmo Robal; Ahto Kalja (ISD, 2008)

Automatic Transformation of SQL Relational Databases to OWL Ontologies. - Irina Astrova; Ahto Kalja (WEBIST (2), 2008)

Interactive hands-on tools as learning objects on web services. - Tarmo Robal; Ahto Kalja (MSE, 2009)

An ontology-based intelligent learning object for teaching the basics of digital logic. - Tarmo Robal; Taavi Kann; Ahto Kalja (MSE, 2011)

Integrating Asynchronous Communication into the OSGI Service Platform. - Marc Schaaf; Volker Ahlers; Arne Koschel; Irina Astrova; Ahto Kalja; David Bosschaert; Roman Roelofsen (WEBIST, 2011)

A Semantic Method of Automatic Composition of E-Government Services. - Riina Maigre; Pavel Grigorenko; Hele-Mai Haav; Ahto Kalja (DB&IS, 2012)

On Proving the Concept of an Ontology Aided Software Refactoring Tool. - Janari Põld; Tarmo Robal; Ahto Kalja (DB&IS, 2012)

Applying User Domain Model to Improve Web Recommendations. - Tarmo Robal; Ahto Kalja (DB&IS, 2012)

Asynchronous Messaging for OSGi. - Arne Koschel; Irina Astrova; Marc Schaaf; Volker Ahlers; Stella Gatziu Grivas; Ahto Kalja (J. Comput. Inf. Technol., 2012)

A Model-based Software Technology Proposal. - Vahur Kotkas; Jaan Penjam; Ahto Kalja; Enn Tyugu (MODELSWARD, 2013)

A Study on User Click Behaviour for WIS User Interface Improvements. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (DB&IS, 2014)

Expectations of Software Development Practitioners for Non-Technical Clients. - Deniss Ojastu; Tarmo Robal; Ahto Kalja (DB&IS, 2014)

The Most Prominent Software Development Concepts Cited in IT Professionals' Blogs. - Deniss Ojastu; Tarmo Robal; Ahto Kalja (BIR, 2015)

A Study on Immediate Automatic Usability Evaluation of Web Application User Interfaces. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (DB&IS, 2016)

A Framework for Improving Web Application User Interfaces Through Immediate Evaluation. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (DB&IS (Selected Papers), 2016)

Refactoring - Key to Success for Constantly Developed Projects. - Janari Põld; Ahto Kalja; Tarmo Robal (EJC, 2016)

A Tool for Design-Time Usability Evaluation of Web User Interfaces. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (ADBIS, 2017)

Scalable Hadoop-Based Infrastructure for Big Data Analytics. - Irina Astrova; Arne Koschel; Felix Heine; Ahto Kalja (DB&IS, 2018)

Moving Hadoop to the Cloud for Big Data Analytics. - Irina Astrova; Arne Koschel; Felix Heine; Ahto Kalja (DB&IS (Selected Papers), 2018)

Guideliner: a Tool to Improve Web UI Development for Better Usability. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (WIMS, 2018)

Design-Time Web Usability Evaluation with Guideliner. - Jevgeni Marenkov; Tarmo Robal; Ahto Kalja (Complex Syst. Informatics Model. Q., 2018)