@article{RSMUP_2015__133__159_0,
     author = {Michalska, Ma{\l}gorzata and Mozgawa, Witold},
     title = {$\alpha $-isoptics of a triangle and their connection to \ensuremath{\alpha}-isoptic of an oval},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {159--172},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {133},
     year = {2015},
     mrnumber = {3354949},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2015__133__159_0/}
}