Please use the direct link from the journal. Researchgate forces one to register before download: https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.337

Please use the direct link from the journal. Researchgate forces one to register before download: https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.337.9966&rep=rep1&type=pdf https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.33...