DOC:10.5254/1.3535021
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DOC:10.5254/1.3535215
DOC:10.5254/1.3535767
DOC:10.5254/1.3535809
DOC:10.5254/1.3535830
DOC:10.5254/1.3535859
DOC:10.5254/1.3538180
DOC:10.5254/1.3538247
DOC:10.5254/1.3538588
DOC:10.5254/1.3538841
DOC:10.5254/1.3547624