@ARTICLE{DasMitSal_j1997, author = {J{\"u}rgen~Dassow and Victor~Mitrana and Arto~Salomaa}, title = {Context-free evolutionary grammars and the structural language of nucleic acids}, journal = {BioSystems}, year = 1997, volume = 43, number = 3, pages = {169--177}, url = {http://dx.doi.org/10.1016/S0303-2647(97)00036-1} }