@article{MAN_1970__188_162032,
     author = {R.A. AL\`O and H.L. SHAPIRO and L. IMLER},
     title = {P- and {z-Embedded} {Subspaces.}},
     journal = {Mathematische Annalen},
     pages = {13--22},
     publisher = {mathdoc},
     volume = {188},
     year = {1970},
     zbl = {0188.55202},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__188_162032/}
}