@article{MZ_1973__132_171912,
     author = {Christoph Hering},
     title = {On {Involutorial} {Elations} of {Projective} {Planes.}},
     journal = {Mathematische Zeitschrift},
     pages = {91--98},
     publisher = {mathdoc},
     volume = {132},
     year = {1973},
     zbl = {0272.50019},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__132_171912/}
}