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DALLAS (AP) _ Dallas coach Don Nelson will not travel with Mavericks for their preseason game Tuesday at Detroit because of back spasms.

Nelson, who has had the spasms for the last two weeks, will undergo tests Monday and Tuesday.

``My back has been feeling better,'' Nelson said. ``But our doctors want to try and determine the cause of these spasms and see if there is a solution to the problem.''

Nelson's son, assistant Donnie Nelson, will coach the team against the Pistons.