Edward G. Coffman Jr. Leopold Flatto Predrag R. Jelenkovic Bjorn Poonen Packing Random Intervals On-Line. 448-476 1998 22 Algorithmica 4 http://link.springer.de/link/service/journals/00453/bibs/22n4p448.html db/journals/algorithmica/algorithmica22.html#CoffmanFJP98