@article{CMUC_1989__30_1_a30,
     author = {\v{D}uri\v{s}, Pavol},
     title = {Two new proof techniques for investigating the computational power of two-way computing devices {[Abstract} of thesis]},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {197--198},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1989},
     zbl = {0682.68064},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a30/}
}