Constructing and validating readability models: the method of integrating multilevel linguistic features with machine learning
Behavior Research Methods (2015) - Comment
pubmed: 24687843  doi: 10.3758/s13428-014-0459-x  issn: 1554-3528 

Yao-Ting Sung, Ju-Ling Chen, Ji-Her Cha, Hou-Chiang Tseng, Tao-Hsing Chang, Kuo-En Chang