http://courses.cs.tau.ac.il/0368-3458/forum/index.php?qa=user&qa_1=kumar17richardson
http://courses.cs.tau.ac.il/0368-3458/forum/index.php?qa=user&qa_1=kumar17richardson
http://courses.cs.tau.ac.il/0368-3458/forum/index.php?qa=user&qa_1=kumar17richardson