@article{RSMUP_2013__130__127_0,
     author = {Ma, Tianshui and Song, Yanan},
     title = {Hopf $ {\pi } $-crossed biproduct and related coquasitriangular structures},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {127--146},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {130},
     year = {2013},
     mrnumber = {3148634},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2013__130__127_0/}
}