0 Pucha{\l}a, Z. Rolski, T. 2008 The exact asymptotic of the collision time tail distribution for independent Brownian particles with different drifts Probability Theory and Related Fields 3-4 595-617 11/2008 Collision time Brownian motion Probability Theory Stochastic Processes http://www.springerlink.com/content/x43570761868m431/