Publications 1987 THE RADIO SPECTRUM OF CYCLOPROPENE J. M. Vrtilek, C. A. Gottlieb, T. J. LePage, and P. Thaddeus Astrophysical Journal, 316: 826-829, 1987 link to paper LABORATORY STUDY OF THE ROTATIONAL SPECTRUM OF VIBRATIONALLY EXCITED C2H D. R. Woodward, J. C. Pearson, C. A. Gottlieb, M. Guelin, and P. Thaddeus Astronomy and Astrophysics, 186: L14-L16, 1987 link to paper LABORATORY AND ASTRONOMICAL SPECTROSCOPY OF C3H2, THE FIRST INTERSTELLAR ORGANIC RING J. M. Vrtilek, C. A. Gottlieb, and P. Thaddeus Astrophysical Journal, 314: 716-725, 1987 link to paper NEW DOUBLETS IN IRC+ 10216: VIBRATIONALLY EXCITED C4H? M. Guelin, J. Cernicharo, S. Navarro, D. R. Woodward, C. A. Gottlieb,and P. Thaddeus Astronomy and Astrophysics,182: L37-L39, 1987 link to paper