A sufficient condition for the convexity of the area of an isoptic curve of an oval
Rendiconti del Seminario Matematico della Università di Padova, Tome 110 (2003), pp. 161-169. 
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     author = {Michalska, M.},
     title = {A sufficient condition for the convexity of the area of an isoptic curve of an oval},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {161--169},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {110},
     year = {2003},
     mrnumber = {2033006},
     zbl = {1121.52011},
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     url = {http://www.numdam.org/item/RSMUP_2003__110__161_0/}
}
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Michalska, M. A sufficient condition for the convexity of the area of an isoptic curve of an oval. Rendiconti del Seminario Matematico della Università di Padova, Tome 110 (2003), pp. 161-169. http://www.numdam.org/item/RSMUP_2003__110__161_0/

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