Alter demonstrated it to witnesses but never developed the idea into a practical system.

More research is necessary to develop and test a practical system.

It is hoped that some day practical systems allow very deep diving.

As a result, this scheme actually works well on many practical systems.

Three approaches can be used to produce a practical system that will function correctly.

It can be a simple and practical system if you are starting a small business.

The results from the current system are insufficient for a really practical system.

The company claims it will produce practical systems by 2008.

To date, the P systems are nearly all theoretical models that have never been reduced to practice, although a practical system is given in.

Two main developments opened the way for a practical system.