Periodic Molecular Arrangements from Space Groups
  We demonstrate, using examples from $2$ and $3$-dimensions, a systematic method of finding all possible periodic arrangements of a given molecule or molecules such that the arrangements have the symmetry of a given space group. The technique is based on work by Rabson {\it et.\ al.\}.   We give tables of generators which facilitate such work. 
Ravi Sachidanandam (1 and 2) and A. B. Harris (2) ((1) Tel-Aviv   University, (2) University of Pennsylvania)