Content of Issue 7
 DOI: 10.3217/jucs-021-07
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| Managing Editor's Column | 
C. Gütl | 
890 | 
| Naive Infinite Enumeration of Context-free Languages in Incremental Polynomial Time | 
C.C. Florêncio, J. Daenen, J. Ramon, J. Van den Bussche, D. Van Dyck | 
891 | 
| A Model of Affect and Learning for Intelligent Tutors | 
Y. Hernández, G. Arroyo-Figueroa, L.E. Sucar | 
912 | 
| Non-Photorealistic Rendering of Neural Cells from their Morphological Description | 
A. Mendoza, S. Mata, L. Pastor | 
935 | 
| Assessing Learning Achievements when Reducing Mobile Video Quality | 
A. Molnar, C. Hava Muntean | 
959 | 
| Tracking Data in Open Learning Environments | 
J.L. Santos, K. Verbert, J. Klerkx, E. Duval, S. Charleer, S. Ternier | 
976 |