text 850 1873 1509 1994
text 850 1549 1509 1748
text 851 622 1509 1380
text 150 1885 815 1981
text 150 1395 806 1777
equation 926 1767 1503 1855
equation 965 1399 1503 1529
abstract 205 540 754 1319
equation 956 536 1503 605
equation 340 1811 803 1863
title 220 240 1446 291
author 148 396 1466 458