@article{CM_1993__87_1_45_0, author = {Li, Jian-Shu and Schwermer, Joachim}, title = {Constructions of automorphic forms and related cohomology classes for arithmetic subgroups of $G_2$}, journal = {Compositio Mathematica}, pages = {45--78}, publisher = {Kluwer Academic Publishers}, volume = {87}, number = {1}, year = {1993}, mrnumber = {1219452}, zbl = {0795.11025}, language = {en}, url = {http://www.numdam.org/item/CM_1993__87_1_45_0/} }