document.write("«&nbsp;<a href='/news/view?id=60310'>A robust and efficient implementation of LOBPCG. (arXiv:1704.07458v1 [math.NA])</a>");document.write(" | ");document.write("<a href='/news/view?id=60312'>A variation principle for ground spaces. (arXiv:1704.07675v1 [math-ph])</a>&nbsp;»");