00348nam a22001337a 4500020001800000100002200018245003800040250001200078260004000090300001100130490003300141650002000174650002000194  a9789349750630  aLawler, Gregory F  aRandom walk and the heat equation  aVol. 55  aTelanganabUniversities pressc2010  aix+156  aStudent mathematical library  aInteger lattice  aBrownian motion