Molecular Conformation of Poly (S-lactic Acid) 

 -  BioPolymers, 6(3), p.299-306, 1968 .
<br/><br/> The predominant role of van der Waal interactions in determining the helical conformations of a simple synthetic linear polymer, as well as helical polypeptides, was pointed out in systematic studies by Liquori et a1.V In the case of homopolypeptides the conformational analysis carried out on the basis of a simple semiempirical function escribing the van der Waal pairwise interactions between the non directly bonded atoms lead to the conclusion that only five helices are allowed (Ra,8 , y, 6, L01).