00290nam a2200121Ia 4500082001700000100001500017245005000032260002500082300001000107490004100117500000500158700000500163  a516bH224.UP  aHammer, J.  aUnsolved problems concerning lattics pointsb  aLondonbPitmanc1977  a101p.  aResearch notes in Mathematicsv v.15  a  a