@conference {1112, title = {Reconstruction of discrete sets from four projections: Decomposable cases}, booktitle = {Conference of PhD Students in Computer Science}, volume = {Volume of Extended Abstracts}, year = {2004}, month = {July 2004}, pages = {22}, author = {P{\'e}ter Bal{\'a}zs and Attila Kuba}, editor = {Tibor Csendes and P{\'e}ter G{\'a}bor Szab{\'o} and Mariann Seb{\H o} and Bal{\'a}zs B{\'a}nhelyi and Judit J{\'a}sz and Gabriella Nagyn{\'e} Hecsk{\'o}} }