@article{MM2_1970__3_154008,
     author = {Robert A. McGuigan},
     title = {On the connectedness of isomorphism classes.},
     journal = {Manuscripta mathematica},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {3},
     year = {1970},
     zbl = {0194.43404},
     url = {http://geodesic.mathdoc.fr/item/MM2_1970__3_154008/}
}