1) COX, D. R. (1966): "NOTES ON THE ANALYSIS OF MIXED FREQUENCY DISTRIBUTIONS," BRITISH JOURNAL OF MATHEMATICAL AND STATISTICAL PSYCHOLOGY, 19, 39-47.
2) GOOD, I. J. AND R. A. GASKINS (1980): "DENSITY ESTIMATION AND BUMP-HUNTING BY THE PENALIZED LIKELIHOOD METHOD EXEMPLIFIED BY SCATTERING AND METEORITE DATA," JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION, 75, 42-56.
3) LEE, Y. (1979): "A NEAREST-NEIGHBOR SPATIAL ASSOCIATION MEASURE FOR THE ANALYSIS OF FIRM INTERDEPENDENCE," ENVIRONMENT AND PLANNING A, 11, 169-176.
4) OKABE, A. AND F. MIKI (1984): "A CONDITIONAL NEAREST-NEIGHBOR SPATIAL-ASSOCIATION MEASURE FOR THE ANALYSIS OF CONDITIONAL LOCATION INTERDEPENDENCE," ENVIRONMENT AND PLANNING A, 16, 163-171.
5) SCOTT, D. W. (1992): MULTIVARIATE DENSITY ESTIMATION. NEW YORK: JOHN WILEY.