Timo Kuosmanen has written:

'The Role of production assumptions in data envelopment analysis' -- subject(s): Data envelopment analysis, Production (Economic theory)

Cecilio Mar Molinero has written:

'Degeneracy in data envelopment analysis' -- subject(s): Data envelopment analysis

'A graphical interpretation of regression with an application to tourism'

The envelopment.

Concealment of movement.

the word envelopment means to develop in any like skill or habit.

Many terms have been used historically, Chaka Zulu called it the horns and the bull, the modern term would be an envelopment. In the open a double envelopment like the "horns and the bull" is required. When a flank is covered by impassible terrain like a sea, marsh or mountain range, it can be used as one of the "horns" and you have a "single" envelopment. With the advent of the helicopter, the Marine Corps developed the "Vertical Envelopment" by inserting a force at a point of their choice to the left, right or rear of the beach head. Airborne forces were also employed in the same manner, that is, to insert a horn point where and when it ws considered effective.