@article {1GN,
 AUTHOR = {Gagrat, M. S. and Naimpally, S. A.},
 TITLE = {Proximity approach to extension problems},
 JOURNAL = {Fund. Math.},
 VOLUME = {71},
 YEAR = {1971},
 NUMBER = {1},
 PAGES = {63--76. (errata insert)},
 MRCLASS = {54E05},
 MRNUMBER = {45 \#2653},
 MRREVIEWER = {J. Mack},
}
@article {2GN,
 AUTHOR = {Gagrat, M. S. and Naimpally, S. A.},
 TITLE = {Proximity approach to extension problems. {I}{I}},
 JOURNAL = {Math. Japon.},
 VOLUME = {16},
 YEAR = {1971},
 PAGES = {35--43},
 MRCLASS = {54E05},
 MRNUMBER = {46 \#4483},
 MRREVIEWER = {J. Mack},
}
@book {3NW,
 AUTHOR = {Naimpally, S. A. and Warrack, B. D.},
 TITLE = {Proximity spaces},
 PUBLISHER = {Cambridge University Press},
 ADDRESS = {London},
 YEAR = {1970},
 PAGES = {x+128},
 MRCLASS = {54.30},
 MRNUMBER = {43 \#3992},
MRREVIEWER = {Eugene F. Steiner},
}
@book {4W,
 AUTHOR = {Willard, Stephen},
 TITLE = {General topology},
 PUBLISHER = {Addison-Wesley Publishing Co., Reading, Mass.-London-Don
 Mills, Ont.},
 YEAR = {1970},
 PAGES = {xii+369},
 MRCLASS = {54.00},
 MRNUMBER = {41 \#9173},
 MRREVIEWER = {C. W. Kohls},
}